Sauna before bed: why you are sometimes wide awake
In short
Out of the blanket warm and then wide awake in bed. That is rarely down to the device and almost always down to the timing.
- Your body temperature needs to drop, and heat first holds that drop back
- Six causes: too late, too hot, too long, not cooled down, screens and drinking
- A timeline counting back from your bedtime, plus a morning option
- If sleep problems persist, see your doctor
You planned a sauna before bed because it sounds relaxing. You come out of the cabin or from under the blanket warm and content, you brush your teeth, you crawl into bed and then nothing happens. No sleep. You are lying there burning up, your heart is still beating just a little too fast and your head is clearer than it has been all evening.
This is one of the questions we get most often: I can't sleep after the sauna, am I doing something wrong? Usually you are not doing anything wrong with the session itself, but you are with the moment you plan it. Below we explain how that works, which six causes are usually behind it and how to set up your evening differently.
We do not claim that heat improves your sleep. What follows is about timing and practical choices, not about promises. If you would first like to read how to build up an evening, take a look at our article on an evening ritual with heat that you can stick to. This article is the other side of that same coin.
Heat and falling asleep: your body needs to cool, not warm up
To understand why a warm session can keep you awake, you need to know one thing about your body temperature. It is not the same all day. It rises during the day, reaches its highest point in the early evening and then gradually drops. That drop continues until somewhere in the second half of the night. After that it climbs again towards the morning.
That drop is normal physiology. It happens with or without a blanket and goes together with the moment most people get sleepy. It is not the case that the drop causes sleep. It is the case that the two coincide in time, and that you can work against that drop in practice.
And that is exactly what a warm session does. The moment you lie in the blanket or stand under the shower, your skin and core temperature go up. Your body responds: the blood vessels in your skin open wide, you start to sweat, and you begin to give off heat. As soon as the heat source is gone, you therefore cool down faster than normal. You first held the drop back and then amplified it.
First up, then down faster
The whole mechanism in one sentence: a warm session first pushes your temperature up and then makes it drop faster than usual. What you notice depends on where you are on that curve when you are in bed.
If you are still in the rising or peak phase, you lie there tossing and turning, warm and clammy. If you lie down once the faster drop has got going, you feel cool and heavy. The same session, the same body, just a different time.
That is why timing with heat in the evening is not a detail but the most important thing there is. People who complain about not being able to sleep after the sauna usually have a timing problem, not a device problem.
I can't sleep after the sauna: the six ordinary causes
Almost every story about lying wide awake after a warm session comes down to one of the following six points, and usually two or three of them are at play at once.
1. Started too late
By far the most common cause. You lost track of time, decide at quarter past ten that you still want to do a session, and at quarter past eleven you are in bed. There was no cooling down phase in between.
You then get the worst of both worlds: the warming up has disrupted your natural drop, and you do not yet notice anything of the faster drop afterwards because it still has to begin. You are lying right at the peak. This happens to almost everyone.
2. Turned up too hot
The higher the temperature, the bigger the peak and the longer it takes you to come back down. Many people set their level high by default because it feels more intense. On a Saturday afternoon that is fine, but in the evening your cooling down time simply grows with it.
A milder setting feels less spectacular but fits much better into an evening. Which settings make sense for what is covered in detail in our complete temperature guide for your infrared blanket.
3. Kept going too long
Length works just like temperature. A session of half an hour and one of fifty minutes are not the same: with the longer one you have lost more fluid, your heart rate stayed raised for longer and your heat surplus is higher.
What people often do is push the timer further because it is just starting to feel good. That is exactly where your evening plan falls apart. Set the timer beforehand and stick to it.
4. Not cooled down
Out of the blanket, dressing gown on, and then straight under a thick duvet. That way you hold on to all the heat you have just built up. Your body wants to release heat and you have wrapped it up.
Actively cooling down makes the biggest difference here: rinse off with lukewarm water instead of warm, open a window, wear light cotton pyjamas instead of fleece, and sit in a cooler room for a while. Small things, and it is the part where people notice a difference the fastest.
5. Bright light and a screen as well
A warm session is a perfect moment to watch something, many people think. You are lying still anyway. The result: half an hour of a bright screen close to your face, with content that gets your head working, in exactly the hour you wanted to wind down.
If you then lie awake, heat may not even be the main suspect. Bright bathroom lighting, a phone in the blanket and a quick look at your email do more than a few extra degrees. Switch off the big lights, leave your phone in another room and use a small lamp.
6. Drank too much right before bedtime
Getting warm costs fluid, and drinking afterwards is sensible. But if you down a litre of water in the fifteen minutes before going to bed, you will be up at two in the morning. That is not a sleep problem but a planning problem.
Spread your drinking over the whole evening instead of catching up afterwards. Drink before and during your session, keep drinking steadily afterwards and keep the last half hour modest. Caffeine and alcohol are not a good combination with a warm session anyway.
From complaint to solution
This overview links what you notice at night to the likely cause and to the adjustment to try first. Change one thing at a time, otherwise you will not know afterwards what made the difference.
| What you notice | Likely cause | What you adjust first |
|---|---|---|
| You are burning up and throw the duvet off | Too little time between session and bedtime | Start an hour earlier and rinse off with lukewarm water |
| You are energetic and wide awake, almost cheerful | Too hot or too long, heart rate still raised | Lower setting and ten minutes shorter |
| You fall asleep quickly but wake up after an hour | Heat not yet gone, room too warm | Make the bedroom cooler, thinner duvet |
| You have to get up two or three times to go to the toilet | Drinking only made up after the session | Spread fluids over the whole evening |
| Your mind keeps racing about work or the news | Screen during or right after the session | Leave your phone in another room |
| You have a headache or feel light headed | Too little to drink around the session | Drink before and during, shorten the session |
Set your alarm or timer for the moment your session needs to end, not for the moment it starts. That way you decide in advance how much cooling down time you have left, instead of finding out afterwards that it is almost midnight.
How long before bedtime to have a sauna: a timeline
How long before bedtime you plan a sauna or a session with an infrared blanket has no fixed answer that is right for everyone. What does help is counting back from your bedtime instead of planning forward from whenever you happen to have time. The timeline below assumes a bedtime of eleven o'clock. Shift everything along if your bedtime is different.
| Time | What you do | Why at this moment |
|---|---|---|
| Around eight | Dinner is over, work wrapped up, glass of water ready | You do not start on a full stomach or with work screens open |
| Half past eight | Start of the warm session, mild setting, timer set in advance | A good two hours of leeway until bedtime |
| Nine o'clock | End of session, rinse off with lukewarm water, put on thin clothing | Actively cooling down is the phase most people skip |
| Quarter past nine | Drink calmly, open the bedroom window, put the device away | The heat you built up now starts to drop noticeably |
| Ten o'clock | Big lights off, a small lamp on, phone out of the room | Light and stimuli go down while your temperature drops |
| Half past ten | Reading, music or just sitting | The transition from doing to doing nothing |
| Eleven o'clock | Bed, room dark and cool | You are in the falling phase instead of at the peak |
If that is still tight for you, move the session to seven or half past seven. If an hour and a half works fine for you, that is good too. The point is that you choose it consciously and keep it the same for a few evenings, so you can see what it does.
If you are wide awake after a warm session, the problem is usually not the heat but the clock.
A warm shower before bed: the same principle, on a smaller scale
Everything above also applies to a warm shower before bed, just in a milder form. A five minute shower puts much less heat into your body than forty minutes under a blanket, so your cooling down phase is shorter.
Still, people run into the same thing: a very hot shower, straight into bed afterwards, and then lying there burning up. The solutions are identical. Shower a little less hot, let the water get cooler for the last half minute, dry yourself well and give yourself twenty minutes to half an hour. In terms of heat load, a warm bath sits between a shower and a sauna session: the longer and the warmer, the more cooling down time afterwards. The same rule, different numbers.
- Timer you set in advance, so your session stops by itself
- Adjustable temperature, so also a mild setting for the evening
- Get warm at a moment you choose, without leaving the house
- 60 days to change your mind and a 2 year warranty
Adjusting your evening session step by step
If you are lying wide awake after your sessions, do not change everything at once. Work through the order below and give each step three or four evenings. That way, at the end, you know which adjustment did the job.
- Shift the timing firstStart an hour earlier than you are used to and change nothing else. For most people this alone solves it.
- Lower the temperature by one settingA milder session gives a smaller peak and therefore a shorter cooling down phase. It feels less intense and fits better into an evening.
- Shorten the sessionTen minutes less makes more difference than you think. Set the timer beforehand and do not push it further during the session.
- Cool down activelyRinse off with lukewarm water, thin clothing, window open, sit in a cooler room for a while. Not straight under a thick duvet.
- Take out the screen and the bright lightPhone in another room during and after the session, big lights off, a small lamp on.
- Move the session to the morningIf none of the above helps, the evening is simply not your moment. That is a perfectly good outcome and not a failure.
If the first step already works, you do not need to do the rest. Most people do not get past step two. A more detailed setup for planning your evening block can be found in our article on building an evening ritual with an infrared blanket.
The morning option: heat as a starting point
Some people do not calm down after a warm session but actually come to life: light, awake and energetic. If that is you, the evening is not your moment. That is not a problem you need to solve, just move it. For a morning session the cooling down phase afterwards is not an obstacle but a pleasant extra. What helps:
- Plan the session after getting up and not right before an appointment, so you can cool down and get dressed calmly afterwards.
- Keep it shorter than an evening session. Twenty to thirty minutes is enough for most people.
- Drink a glass of water before you start. After a night's sleep you already wake up a little short on fluid.
- Rinse off with lukewarm water and then get some daylight. Stepping outside is a strong signal for your daily rhythm.
- Do not do it straight after a hard workout, but first give your body time to settle.
The in between option also works well: the early evening, straight after work and well before dinner. If you want to weigh this up more broadly, our article on morning or evening in your routine goes into it in more depth.
What you are better off not doing
A few things keep coming back in the stories of people who lie wide awake. They seem logical in the moment and almost always turn out wrong.
- Doing another session because you are lying awake anyway. You raise your temperature again and set the clock back further. Rather get up for a while, do something calm in another room in low light and go back when you get sleepy.
- Making the session hotter to relax faster. More heat gives a bigger peak and therefore a longer cooling down phase. For an evening session, milder is almost always wiser.
- Falling asleep during the session. Do not do this. Always use the timer and make sure the device switches off by itself.
- Changing everything at once. A different time, a different setting, a different length and a colder shower in the same week. Then you know nothing afterwards.
- Treating a single bad night as the verdict. Look at a week. There are twenty other things that determine your night on any given Tuesday.
- Using the session to solve a sleep problem. That is not what heat is for, and we do not claim it is. If things keep going badly, your doctor is the right person to see.
Why one person notices nothing and another lies awake for hours
It is tempting to look for a number that is right for everyone: so many minutes before bedtime, at so many degrees, for exactly this long. That number does not exist.
How quickly you cool down depends on your build, how warm your house is, what you are wearing, how used you are to heat and whether you moved a lot that day. On top of that, some people naturally get sleepy early in the evening and others only reach their natural bedtime after midnight. For those two groups, the same time falls at a very different point on the curve.
What does apply to everyone is the direction: warming up first works against the evening drop and then amplifies it. How long that takes and how much of it you notice differs. That is why trying a few evenings and writing it down is more useful than any schedule. Two lines are enough: what time you started and how your night was.
More background on what happens in your body during and after a session can be found on our page what does an infrared sauna blanket do to your body.
Your bedroom helps or works against you
After a warm session, the temperature of your bedroom counts for more than on an ordinary evening. Your body wants to get rid of heat, and a warm, closed room makes that harder.
Open the window an hour before bedtime, in winter too, and have a thinner duvet ready for the evenings when you do a session. If your partner wants a different temperature, a separate duvet for each person is usually the simplest solution.
- Entry model for anyone who wants to try what a fixed warm moment does
- Thin and light, quickly put away after your session
- Timer and adjustable temperature, also for a short mild session
- 60 days to change your mind and a 2 year warranty
When to see your doctor
This article is about timing and habits, not about sleep problems that persist. Make an appointment with your doctor if one or more of these points apply to you:
- You have been sleeping badly for weeks and it does not go away by itself
- You function noticeably less well during the day because of it: work, study, driving, family
- You fall asleep during the day without meaning to
- Your bed partner hears you snoring with pauses in your breathing
- You have restless legs, pain or shortness of breath that keeps you awake
- You use sleeping pills or alcohol to fall asleep
- You worry a lot or feel low and it does not go away
Adjusting a time or a temperature setting does not solve these kinds of things. That calls for proper investigation and treatment. Going to your doctor because you are not sure whether it is serious enough is a perfectly good reason to go.
This article is general information and does not replace medical advice. We sell sauna blankets and red light devices and are not a healthcare provider.
Finally
Lying wide awake after a sauna before bed almost never means that you are sensitive or that the device does not suit you. It usually means you were in bed at the peak instead of in the drop that follows.
The order to fix it is simple: start earlier, set it milder, keep it shorter, cool down actively and take out the screen. If that does not work, move the session to the morning or the early evening. That is not a compromise, just a different approach.
Want to read more about heat and using it at home? Take a look at the knowledge base or browse the infrared sauna blankets. And if you sleep badly on a regular basis, see your doctor. That remains the only advice we really insist on.
Frequently asked questions
Why can't I sleep after the sauna?
To fall asleep, your body temperature drops in the evening. A warm session first pushes that temperature up and then actually makes it drop faster. If you lie in bed while you are still at the peak, you lie there warm, tossing and turning. Usually the timing is the problem, not the device.
How long before bedtime should I have a sauna or a session with an infrared blanket?
There is no number that is right for everyone. Count back from your bedtime instead of planning forwards. Two hours of leeway is a pleasant starting point for many people: session finished, rinse off with lukewarm water, drink calmly, lights down and only then to bed. If you notice you need more time, move it further forward.
Is a warm shower before bed a problem?
The same principle applies, just in a milder form. A shower puts much less warmth into your body than a long session under a blanket, so your cooling down phase is shorter. Shower a little less hot, let the water get cooler for the last half minute and give yourself twenty minutes to half an hour before you lie down.
Does warmth in the evening improve my sleep?
We do not claim that. Many people find a warm session relaxing and a reason to lie still for half an hour without a screen. What that then does for your night differs per person. If you sleep badly on a structural basis, see your GP.
What should I change first if I am lying wide awake?
Shift the timing. Start an hour earlier than you are used to and change nothing else. For most people that alone solves it. If it does not help, lower the temperature one setting, shorten the session, cool down actively and take the screen out of it. Change one thing at a time.
What is the best way to cool down after a session?
Rinse off with lukewarm rather than warm water, put on thin cotton clothing, open a window and sit in a cooler room for a while before you go into the bedroom. Crawling straight under a thick duvet holds in exactly the warmth your body wants to get rid of.
Why should I be careful with drinking just before bedtime?
Getting warm costs fluid, so drinking is sensible. But if you make up for it afterwards with a litre of water in the last fifteen minutes, you will be up during the night. Spread your drinking over the whole evening: before and during the session, steadily afterwards, and modestly in the last half hour.
Is it better to use an infrared blanket in the morning?
If a warm session actually makes you feel energetic, the morning or early evening is the more logical moment for you. The cooling down phase afterwards is then not an obstacle. Keep a morning session shorter, drink a glass of water beforehand and get some daylight after cooling down.
Should I set the temperature lower for an evening session?
That often helps. The higher the setting, the bigger the peak and the longer it takes for your temperature to drop back. A milder session feels less intense but fits better into an evening, because your cooling down time is shorter.
Why does it bother one person and not another?
How quickly you cool down depends on things such as your build, how warm your house is, what you are wearing and how much you moved that day. On top of that, some people naturally get sleepy early and others only late, so the same time falls at a very different point on the curve.
Can I do another session if I am lying awake?
Better not. You raise your temperature again and set the clock back further. Rather get up for a while, do something calm in another room in low light and go back when you get sleepy.
When should I see my GP about sleep problems?
Make an appointment if you have been sleeping badly for weeks and it does not pass by itself, if you function noticeably less well during the day, if you fall asleep without meaning to, if you snore with pauses in your breathing or if you need something to help you fall asleep. This article is general information and does not replace medical advice.
