Why Is It Hard to Sleep When It Is Too Hot

Almost everyone knows this feeling. The day has been hot, the night is still warm, and you lie in bed wide awake while the clock moves slowly forward. Your pillow feels warm, your back feels sticky, and every time you turn over you find another warm patch. You are tired, you want to sleep, and yet sleep will not come. It is one of the most common sleep problems in the world, and it is also one of the most misunderstood. People often think they are too worried or too restless, when the real problem is much simpler: their body is too warm. Sleep is not just about feeling tired. It is also about temperature. Your body has to lose a little heat before it can settle into sleep, and when the room, the bed and the air around you are all hot, that loss cannot happen properly. This article explains, in plain words, why heat makes sleep so hard, what happens inside your body on a hot night, and what small changes can actually help.

It helps to start with the confusion, because that confusion is part of why hot nights feel so frustrating. Most of us were taught, without anyone ever saying it directly, that sleep follows tiredness. You work hard, you get tired, you fall asleep. On most nights that pattern holds, and we stop questioning it. Then a hot night comes, and the pattern breaks. You have had a long day, your eyes are heavy, your legs ache, and still you lie awake. Nothing in your mind is racing. You are not solving a problem or replaying an argument. You are simply warm, and the warmth will not leave you alone. The tiredness is real, but it is not enough on its own. That is a strange discovery the first time you notice it, and it can leave you wondering whether something is wrong with you. Nothing is wrong with you. You are meeting a simple fact about how sleep works, a fact that only shows itself clearly when the weather turns hot.

The Cooling Signal Your Brain Waits For

Your body follows a daily rhythm, and temperature is a large part of that rhythm. During the day your inner temperature sits a little higher, which helps you stay awake, move around and think clearly. In the evening it begins to fall, slowly and steadily, and that fall is one of the strongest messages your body sends to your brain that night has arrived. When the temperature drops, you start to feel heavy-eyed, your thoughts slow down, and sleep begins to feel natural. It is a quiet message, but it is very powerful. You do not need to think about it or try to make it happen. It happens on its own, night after night, as long as nothing stands in its way.

Heat stands in its way. When the room is hot, your body cannot pass its warmth into the air around it, so its temperature stays high instead of falling. Your brain is waiting for the cooling message, and the message never arrives, or it arrives much later than usual. That is why you can feel exhausted after a long hot day and still lie awake for an hour or more. The tiredness is real, but the temperature message is missing, so the two halves of sleep do not meet. You are tired and warm at the same time, and that combination is deeply uncomfortable, in a way that tiredness alone never is.

Think of it like trying to rest after a long walk in the sun. Your face is warm, your shirt is damp, and your body feels heated from the inside. Even if you sit down in the shade, it takes a while before you feel cool again. Sleep works in a similar way. Your body needs that cooling-down time, and a hot bedroom takes it away. This is also why a cool shower before bed often helps people fall asleep faster. The shower does not make you cold. It helps your body release heat, and as the water dries from your skin, your temperature drops a little, which is exactly the message your brain has been waiting for. The same idea explains why the first night of a heatwave is often the worst. Your body has not had time to adjust, the house is still holding the heat of the day, and the bed feels as though it has been warmed by the sun all afternoon.

Sweat, Sticky Skin and Why Comfort Matters

Sweat is your body’s main tool for cooling down, and on a hot night it works hard. When the air is warm, your body sends more blood to the skin so that heat can escape, and your sweat glands start producing moisture. As that moisture dries, it carries heat away with it. That system works well when you are standing in a breeze, but it works very badly when you are lying flat in a warm, still room. There is no breeze under a blanket, and the air between your body and the sheet quickly becomes warm and damp. The sweat has nowhere to go, so it stays on your skin, and instead of cooling you, it makes you feel sticky and uncomfortable.

That sticky feeling matters more than people think. Sleep is not only about temperature. It is also about comfort. If your skin feels damp and your clothes cling to you, your brain keeps noticing it. Every small discomfort is a little nudge that keeps you awake. You turn over, you kick the sheet away, you wipe your forehead, and each movement wakes you up a little more. A person in a cool room can lie still for a long time without thinking about their body at all. A person in a hot room is reminded of their body every few minutes, and that constant reminder is the opposite of sleep. Comfort is not a luxury here. It is the background quiet that sleep needs, and heat takes that quiet away.

There is another problem with sweating at night. When you sweat, you lose water, and losing water through the night can leave you thirsty. Many people wake up in the middle of a hot night with a dry mouth and a strong need for a drink. That is your body asking for what it has lost. It is a sensible request, but it breaks your sleep, and after you drink and lie down again, it can take a long time to fall back asleep, especially if the room is still hot. Some people also find that their skin feels itchy or irritated after a sweaty night, which adds another reason to keep waking up. None of this is dangerous for a healthy person, but it all adds up to a night of broken, shallow sleep instead of the deep, restful sleep your body needs.

Deep Sleep Gets Thinner in the Heat

Even when you do manage to fall asleep in the heat, the sleep you get is often lighter and more broken than usual. Sleep is not one long, even stretch. It moves through stages, from light sleep into deeper sleep and back again, and deep sleep is the part that leaves you feeling truly rested in the morning. Heat disturbs those stages. When your body is too warm, it spends more time in light sleep and less time in deep sleep, and it wakes up more easily. A small sound, a movement, or a change in temperature that you would normally sleep through can wake you when you are already hot and uncomfortable.

Many people describe this as sleeping with one eye open. They are not fully awake, but they are not fully asleep either. They remember the night in pieces: falling asleep late, waking at two in the morning, turning over, waking again before dawn, and finally giving up and getting out of bed feeling tired. That broken pattern is very typical of hot nights, and it explains why you can spend eight hours in bed and still wake up feeling as if you have hardly slept at all. The hours were there, but the deep, restful part of sleep was missing. It is the difference between spending a long time in a room and actually resting in it. The bed held you, but the heat kept pulling you back towards the surface.

The room itself plays a large part in this. A room that feels fine at nine in the evening can feel much hotter by midnight, because your body has been giving off heat into the bed and the air for hours, and the walls of the house may still be releasing the heat they absorbed during the day. If the windows are closed, the air becomes stale as well as warm, and that makes the room feel even heavier. If the windows are open but there is no breeze, the air may still feel thick and still. This is why people often find that they fall asleep quite easily on a hot night but wake up a few hours later and cannot get back to sleep. The first part of the night was cool enough, but as the night went on, the heat built up around them until it became too much.

The Search for a Cool Patch of Bed

Tossing and turning is your body’s way of searching for a cool spot. When you lie in one place for a while, the sheet under you warms up and the mattress holds that warmth. You turn over to find a cooler part of the bed, and for a few minutes it feels better. Then that spot warms up too, and you turn again. On a cool night this hardly happens, because the bed stays at a comfortable temperature and your body can stay still. On a hot night, the search for coolness never really ends, and each turn is a small waking. You may not remember every turn in the morning, but your body does, and the result is that you feel restless and unrefreshed.

The bedding you use makes this better or worse. A thick blanket, a heavy quilt or a mattress that traps heat will all make the problem worse, because they hold warmth close to your body and stop air from moving. Light cotton sheets, a thin cover and a mattress that allows air to pass through will help, because they let heat escape instead of storing it. Many people find that simply removing the top blanket, or sleeping with only a thin sheet, makes a real difference on a hot night. It sounds too simple to matter, but on a night when your body is struggling to cool down, even a small change in what is covering you can change how easily you fall asleep.

Your night clothes matter in the same way. Heavy clothes made from thick material trap heat and sweat, while loose, light clothes made from cotton or another breathable fabric let air reach your skin. Some people sleep better with very little clothing on a hot night, and that is a sensible choice, because it gives your skin the most air. There is no rule here. The point is to wear as little as you need to feel comfortable, and to choose fabric that does not cling to you when you sweat. A damp, clinging shirt is one of the most uncomfortable things to sleep in, and it is a common reason people wake up again and again on hot nights.

Thirst, Dry Mouth and Waking in the Night

Water is a quiet part of the sleep story that people often forget. During the day you drink when you feel thirsty, and your body replaces what it loses. At night you cannot drink while you sleep, so any water you lose through sweat is gone until morning. On a hot night, that loss can be enough to wake you with a dry mouth, a dry throat or a headache in the morning. The thirst itself is not dangerous, but the waking is. Once you are awake and thirsty, you have to get up, find water, drink it, and then try to fall asleep again in a room that is still hot, which is often harder the second time.

Drinking enough water during the evening can help, but timing matters. If you drink a large amount of water just before bed, you may wake up in the night needing the toilet, which is another kind of broken sleep. The better habit is to drink steadily through the evening, so that your body goes to bed well supplied with water, and then to keep a small glass or bottle of water beside the bed. That way, if you do wake up thirsty, you can take a few sips without getting up, switching on a bright light or fully waking yourself. Small sips are enough. You do not need to drink a whole bottle in the middle of the night.

What you drink in the evening matters too. A cold drink feels refreshing, and it can help you cool down a little, but very cold drinks are not always the best choice, because your body has to work to warm them up again. Room-temperature water, or water that is only slightly cool, is usually a good choice. Sweet drinks, on the other hand, are not a good idea late in the evening, because the sugar can leave your mouth feeling sticky and can make you feel more awake. A plain glass of water is the simplest and best choice, and it is the one your body actually needs. If you have spent the day working in heat, or you have been sweating a lot, drinking water through the evening is even more important, because you are starting the night already low on water.

There is a small detail here that many people miss, and it is the difference between being thirsty and being dry. On a hot night you may wake not because your body is short of water in a serious way, but because your mouth and throat feel dry from breathing warm, dry air. A few sips can fix that dryness quickly, and then you can settle again. If you get up and drink a large amount, you may feel full and uncomfortable, and you may wake again later for the toilet. So the habit to build is a modest one: a glass beside the bed, a few slow sips, and then back to rest. It sounds like almost nothing, and that is the point. On a hot night, the things that help are often small and quiet, and they work best when they do not wake you up fully.

A Hot Day Follows You Into the Night

A hot night rarely starts at bedtime. It starts in the morning, when the sun heats the roof and the walls of the house, and it builds all day. By the evening, the rooms inside the house can be warmer than the air outside, because the building itself has stored the heat. This is why a house can feel like an oven at ten at night even when the air outside has started to cool. The heat is not only in the air. It is in the walls, the floor, the mattress and the pillows, and all of those things slowly release their warmth through the night.

The day you have had matters as well. If you spent the day working outside, walking in the sun or doing heavy work, your body may still be warm hours later. Muscles that have worked hard stay warm, and a body that has been sweating all day may still be trying to cool down long after sunset. A heavy meal late in the evening can add to this, because digesting food produces heat inside the body. That is why a large, heavy dinner on a hot day can make the night even harder. A lighter evening meal, eaten a little earlier, gives your body less extra heat to deal with when it is trying to cool down for sleep.

Light also plays a part. On long summer days, the sun sets late and the light stays bright well into the evening. Bright light tells your brain that it is still daytime, and that message works against the cooling message your body is trying to send. If you sit in a bright room, or look at a bright screen, until the moment you go to bed, your brain may still think it is day, even though you are tired. Dimming the lights in the evening, and giving yourself a quiet hour before bed, helps your brain catch up with the time of day. It is a small habit, but on a hot night, when sleep is already hard, every small help counts.

Some People Feel a Hot Night Far More

Not everyone suffers equally on a hot night. Children often feel the heat more than adults, because their bodies are smaller and they warm up and cool down faster, and because they may not think to drink water or kick off a blanket when they are hot. Older people often feel it more too, because their bodies are slower to adjust to changes in temperature, and because they may be less aware of thirst. If you live with children or older relatives, it is worth checking on them on very hot nights, and making sure their rooms are as cool as you can make them, with light bedding and water nearby.

People who work outdoors, or who do heavy physical work, also feel hot nights more keenly, because their bodies have been heated all day and they need the night to recover. For them, a bad night’s sleep is not just uncomfortable. It affects the next day’s work, because a tired body is slower, less careful and more likely to make mistakes. This is one reason why heat and poor sleep can build into a difficult cycle during a long hot spell. Each hot night makes the next day harder, and each hard day makes the next night harder to sleep through, because the body never fully recovers.

Women who are pregnant, and people who carry extra weight, often find hot nights harder as well, because their bodies produce more heat and have a harder time losing it. This is not a fault or a weakness. It is simply how bodies work. A larger body holds more heat, and a body that is already working hard has less room to cool down. For these people, the small steps in this article matter even more: light bedding, cool air, water beside the bed and a cool shower before sleep. None of these steps is difficult, but together they can turn a night of tossing and turning into a night of real rest.

Small Changes That Let Cooling Happen

The most useful step is to cool the room before you go to bed, not after. Open the windows in the evening when the outside air starts to cool, and let the cooler air push the hot air out of the room. If you have a fan, place it so that it moves air across the room rather than blowing straight at your face all night, because a fan blowing on one spot can dry your eyes and throat. Some people place a bowl of cold water in front of a fan, so that the moving air feels a little cooler, and this simple trick can make a room feel more comfortable without any cost.

Cooling your body before bed is the second useful step. A lukewarm shower is better than a very cold one, because a very cold shower can make your body tense up and then warm itself back up again. A lukewarm shower, followed by letting your skin dry in the air for a few minutes, helps your temperature fall gently, which is the message your brain needs. Light bedding and loose clothes, as described earlier, are the third step, and water beside the bed is the fourth. These four steps do not need money or special equipment. They need a little planning in the evening, and they are the steps that help most people most of the time.

It is also worth knowing what does not help. Staying up late in the hope that you will be so tired that you fall asleep anyway rarely works on a hot night, because tiredness and heat together do not make sleep. They make restlessness. Lying in bed awake for hours, getting more and more frustrated, also makes sleep harder, because frustration wakes your mind up. If you have been lying awake for a long time and you feel hot and frustrated, it is often better to get up, go to a cooler part of the house, drink some water, and sit quietly for a while until you feel cooler and calmer. Then go back to bed. This is not giving up. It is giving your body the cooling time it needs, and it often works better than lying in a hot bed getting angrier.

A final point is about patience, because it is the hardest part of a hot night and the part no list of tips can replace. Sleep cannot be forced, and heat cannot be argued with. The most you can do is set the conditions as well as you can, and then wait. Open a window, take a shower, change into light clothes, drink some water, and give your body the chance it needs. If sleep still comes late, that is not a failure. It is a hot night doing what hot nights do. Remember what helped and what did not, so that the next hot night is a little easier. That is how people learn to live with heat, not by finding one perfect trick, but by building a small set of habits that make the night bearable, one hot evening at a time.

My Take:

If you ask me why it is so hard to sleep when it is too hot, my answer starts with a simple idea that I wish more people knew: sleep is not only about being tired, it is also about being cool. I think most of us learned to think of sleep as a switch that tiredness turns off, as if a long day should be enough on its own. But my own experience on hot nights tells me something different. I have had days when I was exhausted from work, when my eyes were heavy and my body was aching for rest, and I still lay awake for an hour in a warm room, turning from side to side and watching the ceiling fan go round. The tiredness was real, but the coolness was missing, and without that coolness, sleep would not come. That taught me that tiredness is only half the story, and temperature is the other half, and when the second half is missing, the first half cannot do the job alone.

I think the reason this surprises people is that we cannot see temperature the way we can see tiredness. Tiredness is obvious. You feel it in your eyes, in your legs, in the way your thoughts slow down. Temperature is quieter. You feel warm, but you do not always connect that warmth with the fact that you cannot sleep. Instead, you start to blame other things. You think you are worried, or you think you drank too much tea, or you think the day was too busy. Sometimes those things are true as well, but on a hot night, the simplest explanation is usually the right one: your body is too warm to fall asleep. I like simple explanations, because they lead to simple answers, and the answer here is not a pill or a trick. It is cooling down, slowly and gently, before bed.

There is something else I have noticed about hot nights, and it is about how unfair they can feel. A hot day is hard enough on its own. You work in the heat, you sweat, you drink water, you wait for evening. Then evening comes, and instead of rest, you get another struggle, this time in your own bed. It feels as if the heat has followed you home and will not leave you alone. I understand that frustration, because I have felt it myself. The bed, which should be the one cool and quiet place in the house, feels warm and sticky, and the night, which should be a rest, feels like more work. I think it helps to name that frustration honestly, because once you name it, you can stop blaming yourself for it. You are not bad at sleeping. You are sleeping in heat, and heat makes sleep hard for almost everyone.

I also think we should be honest about who suffers most, because hot nights are not equal. A person with a fan, a cool room and light bedding will sleep better than a person in a small, crowded room with no air moving at all. A labourer who has worked all day in the sun will find the night harder than a person who spent the day indoors. An older person, a small child, or a person who is unwell will feel the heat more keenly. I do not say this to make anyone feel hopeless. I say it because the help should go where the heat is worst, and because a small kindness, like opening a window, sharing a fan, or giving a child a cool drink before bed, can matter more than it looks. On a hot night, comfort is not a luxury. It is what makes rest possible, and rest is what makes the next day possible.

When I think about what actually helps, I come back to the same plain habits every time: cool the room early, take a lukewarm shower, wear light clothes, use light bedding, and keep water beside the bed. I like these steps because they are honest. They do not promise a miracle, they do not cost money, and they do not need any special skill. They simply work with the body instead of against it. Your body wants to cool down. These steps help it do what it already wants to do. That is very different from the advice you sometimes hear, like staying up until you collapse, or drinking something strong to knock yourself out. Those ideas fight the body. Cooling works with it, and in my experience, working with the body is always the better choice.

I also want to say something about patience, because hot nights test it. When you cannot sleep, every minute feels long, and the temptation is to get angry, to check the clock again and again, and to worry about how tired you will be tomorrow. I have done all of that, and I can tell you it never helped. What helped was getting up, going somewhere cooler, drinking water, and waiting until my body felt ready. It felt like giving up at the time, but it was not giving up. It was giving my body time. Sleep is not something you can force, and heat is not something you can argue with. The best you can do is make the conditions right, and then let sleep come when it is ready. That sounds slow, and it is slow, but on a hot night, slow is the only speed that works.

There is a wider lesson in this too, and it is about how much our homes matter. We often think of sleep as something that happens inside us, as if the room does not matter. But a hot night shows us that the room matters a great deal. A house that stays hot all night, with no air moving and no cool place to rest, is a hard place to sleep in, no matter how tired you are. I think about this when I hear people talk about sleep as if it were only about discipline or willpower. Discipline does not cool a room. What cools a room is air, shade, water and time, and those are things we can plan for in the evening, before the heat of the day has settled into the walls. If we plan a little, the night becomes easier, and if we do not plan, the night becomes a struggle. That is not a judgement. It is simply how heat works.

I think the most useful thing I can say is this: do not fight the heat, and do not fight yourself. If the night is hot, accept that sleep may come a little later, and use that time to cool down rather than to worry. Open a window, take a shower, change into light clothes, drink some water, and give your body the chance it needs. If you still cannot sleep, get up and sit somewhere cooler for a while. You are not failing. You are doing the sensible thing in difficult conditions. And when the night is over, remember what helped and what did not, so that the next hot night is a little easier. That is how people learn to live with heat, not by finding one perfect trick, but by building a small set of habits that make the night bearable, one hot evening at a time.

So here is my final view, in plain words. It is hard to sleep when it is too hot because your body needs to cool down to fall asleep, and heat stops that cooling from happening. Your skin stays warm, your sweat stays on you, your sleep stays light and broken, and your thirst keeps waking you. None of that is your fault, and none of it means there is something wrong with you. It means the conditions are wrong, and conditions can be changed, a little at a time. Cool the room early, cool your body gently, wear light clothes, use light bedding, and keep water close. Do those things, be patient with yourself, and let sleep come when your body is ready. In my view, that is the honest answer, and it is enough.

I also think about the mornings after a hot night, because that is where the cost is paid. A person who has tossed and turned all night does not just feel tired. They feel slow, their head feels heavy, and small jobs take longer than they should. I have had mornings like that, when I sat with a cup of tea and felt as if my thoughts were moving through thick air. It is a miserable way to start a day, and it is made worse by knowing that the night is coming again, and that it will probably be hot again. That feeling, of facing the same struggle night after night, can make a whole hot season feel endless. I think it helps to remember that the season does end, and that each small improvement, a cooler room, a better night, is a step toward feeling human again. You do not have to fix the whole summer. You only have to make tonight a little better than last night.

There is something I have learned about asking for help with sleep, and it is that people are often too proud to ask. We treat sleep as a private matter, as if struggling to sleep were a personal failure. But heat is not private. It affects the whole house, the whole street, the whole town, and talking about it helps. When I have talked with family about hot nights, I have always found that someone else has a trick I had not thought of, a way of placing a fan, a way of hanging a damp sheet, a way of cooling a room that I had never tried. That sharing matters, because no one person knows every answer, and the best answers are often the ones that have been passed from one home to another, tested by real people on real hot nights. If you know something that helps you sleep in the heat, tell someone. It may be the one thing that helps them too.

I think the last thing worth saying is about the body itself, and how much it deserves our trust. Your body is not working against you on a hot night. It is working very hard to cool you down, to keep you safe, to help you rest, and it is doing that work in conditions that make it very difficult. The sweat, the restlessness, the waking, these are not signs that your body has failed. They are signs that it is trying, and that it needs help from you: cooler air, lighter covering, water, and time. When you give it those things, it usually responds quickly, and sleep comes. I find that thought comforting, because it means I am not fighting my own body. I am working with it, and working with it is always easier than working against it. A hot night is hard, but it is not hopeless, and a little cooling, a little patience, and a little kindness to yourself can carry you through it, one night at a time.

If a friend asked me for one piece of advice about hot nights, I would not give them a long list. I would tell them to watch the evening, not the night. The evening is where the night is decided. If the windows are opened when the air first cools, if the shower is taken before the heat has settled into the skin, if the bed is made light and the water is placed beside it, then the night has a fair chance. If all of that is left until the moment of lying down, the night is already lost, and no amount of turning over will win it back. That is a small shift in thinking, from fixing the night to preparing the evening, and it is the shift that changed hot nights for me. It does not make the heat disappear. It simply gives sleep a fair chance, and on a hot night, a fair chance is the most anyone can ask for.

One more thing I have come to believe is that a hot night teaches you to pay attention to your own body in a way that a comfortable night never does. When sleep comes easily, you do not think about it at all. You lie down, you close your eyes, and the morning arrives. When heat makes sleep hard, you are forced to notice things you normally ignore: how warm the pillow feels, how still the air is, how much water you drank in the evening, whether the window was opened in time. That attention is not a burden. It is a kind of learning, slow and practical, and it stays with you. The next summer, you remember. You open the windows earlier. You take the shower without being told. You keep the bedding light. Nobody has to remind you, because your body remembers the hot nights, and it remembers what helped. In that sense, the worst nights teach the best lessons, and the lessons are simple enough that anyone can carry them.

Frequently Asked Questions

Can “why is it hard to sleep when it is too hot” feel different for children and adults?

Yes, it can feel different. Children warm up and cool down faster than adults, and they may not think to drink water or push off a blanket when they are hot, so they often wake up restless and thirsty. Adults are usually better at noticing the heat and doing something about it, but they still struggle when the room stays warm all night. Older people often feel it most, because their bodies adjust to temperature changes more slowly, and they may not feel thirsty even when they have lost water through sweat.

What makes “why is it hard to sleep when it is too hot” easier to understand in plain words?

It becomes easier when you remember one idea: your body has to lose a little heat before it can fall asleep properly. On a hot night, the room, the bed and the air are all warm, so your body cannot lose heat, and the cooling signal that tells your brain it is time to sleep never arrives properly. Once you understand that, the rest makes sense: the sweating, the tossing and turning, the thirst and the light, broken sleep are all signs of a body struggling to cool down.

In simple words, what does “why is it hard to sleep when it is too hot” mean?

In simple words, it means that heat stops your body from doing the cooling it needs for sleep. Your temperature stays high, your skin stays damp with sweat, and your sleep stays light, so you wake up often and feel tired in the morning even after hours in bed. It is a normal response to a hot room, not a sign that something is wrong with you, and it usually improves as soon as the room and the bed become cooler.

Why do people ask “why is it hard to sleep when it is too hot” so often?

People ask it so often because almost everyone has lived through it, especially during summer and heatwaves, and because it feels confusing. You can be very tired and still lie awake, which does not match the idea that tiredness alone should bring sleep. People want to know whether the problem is worry, a bad habit, or something else, and the honest answer is usually the simplest one: the heat itself is keeping the body too warm to settle into deep sleep.

Does “why is it hard to sleep when it is too hot” change with age or daily routine?

Yes, it changes with both. Children, older people, people who work outdoors and people who are pregnant or carry extra weight often feel hot nights more strongly, because their bodies either warm up faster or cool down more slowly. Daily routine matters too. A day spent working in the sun, a heavy late meal, or a bright, noisy evening can all make the night harder, while a cooler evening, a light meal and a calm hour before bed can make it easier.

When is “why is it hard to sleep when it is too hot” most noticeable?

It is most noticeable during heatwaves and long hot spells, when the house itself has stored heat in its walls and the bedroom stays warm well past midnight. It is also most noticeable in the second half of the night, when your body has been giving off heat into the bed for hours and the air around you has become warm and still. On those nights, many people fall asleep at first but wake up after a few hours and find it very hard to fall asleep again.

Sources

• NHS — general health information: https://www.nhs.uk/
• World Health Organization — health topics: https://www.who.int/
• Centers for Disease Control and Prevention — health information: https://www.cdc.gov/
• Mayo Clinic — general health information: https://www.mayoclinic.org/
• Healthline — general health information: https://www.healthline.com/