A common target for the bedroom is roughly 60 to 67°F (16 to 19°C): cool enough that your body can shed a little heat, but not so cold that you tense up. There is no single perfect number, so treat this as a starting range and adjust by a degree or two. The bigger lever is timing your evening so your body is already cooling down when you get into bed.
Start here: a quick temperature guide
If you want one place to start tonight, set the room toward the cooler end of comfortable and adjust from there.
- General target for adults: around 60 to 67°F (16 to 19°C)
- Hot summer nights: aim to keep it under about 71°F (22°C); a fan or cooling helps more than the exact number
- Cold winter nights: many people are comfortable around 64 to 68°F (18 to 20°C); below roughly 53°F (12°C) tends to make it harder to fall asleep
- Humidity: a moderate 40 to 60% range feels more comfortable than the temperature reading alone suggests
- Babies, older adults, and anyone with a health condition: lean a little warmer and follow individual comfort rather than a fixed number
These are general guidance, not medical targets. Use them as a place to begin, then trust how you actually feel.
Three things to try tonight
You do not need a new thermostat to get the benefit. Most of the gain comes from helping your body cool down on schedule.
- Take a warm shower or bath about 90 to 120 minutes before bed, so your body temperature rises and then drifts down by lights-out.
- Make the room a little cooler than your daytime comfort, and keep air moving with a fan or a cracked window if it is safe to do so.
- A few minutes before bed, check the practical stuff: breathable bedding, blinds or curtains closed, and the heating or cooling set so it will not swing while you sleep.
You can lay these out on a single timeline with the Evening Routine Builder. It runs in the browser, with no login and nothing saved.
Why a cooler room helps you fall asleep
Your body runs on a daily temperature rhythm. Core body temperature peaks in the late afternoon, then drifts down in the evening, and that downward slope is part of how the body gets ready for sleep. This is one piece of thermoregulation, the way the body keeps its core temperature within a narrow band.
A cooler room makes it easier to lose that small amount of heat, mostly through the hands and feet. When the room is too warm, the body cannot offload heat as easily, and that can show up as restlessness and lighter sleep. The drop in core temperature also lines up with the evening rise in melatonin, so a cool, dark room reinforces both signals at once. If you want the background on what those lighter stretches of sleep actually are, see Sleep cycles: the truth about the 90 minute rhythm.
What too hot and too cold each feel like
Both extremes tend to fragment sleep, just in different ways.
A room that runs too warm is the more common problem. Heat makes it harder to fall asleep, raises the odds of waking during the night, and can shorten the deeper, more restorative stretches. If you regularly sleep close to eight hours but still wake up groggy, an overheated room is one of the quieter suspects worth ruling out. Why you wake up tired after 8 hours walks through the others.
A room that runs too cold is less common but real. When your hands and feet get cold, the body holds onto heat instead of releasing it, and that can delay sleep onset. The practical answer is usually warmer feet rather than a hotter room: socks or a hot water bottle near your feet often does more than turning the whole thermostat up.
Adjusting for hot and cold nights
The right setting changes with the season, and the practical moves matter more than chasing an exact degree.
Hot summer nights
On warm nights, comfort comes from moving air and managing humidity, not just from a lower number. A fan, a cooler setting on the air conditioner, and lighter, breathable bedding usually help more than dropping the temperature aggressively. A timer can let the room cool as you fall asleep without staying cold all night.
If you sleep without air conditioning, focus on airflow, a cool shower before bed, and keeping daytime heat out by closing blinds in the afternoon. One safety note: in a genuine heat wave, staying cool is a health matter, not just a sleep one. The goal is never to endure dangerous heat to save energy.
Cold winter nights
In winter, the risk is usually a room that swings between too warm and too cold as the heating cycles. A steadier, moderate setting beats a hot room that then drops sharply overnight. Watch humidity too: heating dries the air, and very dry air can make your throat and nose uncomfortable enough to wake you.
A few practical points on running heating or cooling overnight. Leaving it on can keep the room steady, but it can also dry the air, over-cool a room, and add to your energy bill, so it is a personal trade-off rather than a rule. A timer or a thermostat schedule is often a better middle ground than full-on or full-off.
Folding room temperature into your evening routine
Temperature works best when it is part of the wind-down rather than a separate task you forget. The simplest version: a warm shower earlier in the evening, then a cooler room and breathable bedding by the time you settle.
The warm shower is the piece people miss. A warm shower or bath about 90 to 120 minutes before bed raises your body temperature briefly; the drop afterward may help bring on the sleepy feeling as you head to bed. It is a small nudge rather than a sleep remedy, and timing matters more than water temperature.
The Evening Routine Builder takes your bedtime and the time you have, then lays out a plan that can include a warm shower step, a lights-down step, and a short breathing block. You can place the warm shower early and keep the last 30 minutes calm and cool. For a fuller walk-through of building the wind-down itself, see the Evening Routine Guide, or the shorter 30-Minute Wind-Down Routine if you are short on time.
Temperature is one of a few evening factors worth getting right. The other two common ones are screens and caffeine, covered in Phone Before Bed and the caffeine cutoff time before bed.
Age and individual differences
There is no number that suits everyone, and that is normal. Age, metabolism, hormones, bedding, and personal preference all shift where you are comfortable.
As a general pattern, babies and older adults tend to do better a little warmer than the adult range, and follow comfort rather than a fixed reading. If you are pregnant, managing a health condition, or find your temperature regulation feels off, treat the ranges here as general background and let your own comfort and your clinician guide the specifics.
When you have no thermometer
You do not need a thermometer to get this roughly right. The body-comfort test works well: you want to feel slightly cool when you first get under the covers, then warm up within a minute or two. If you are sweating or kicking off the blanket, the room is likely too warm; if your feet stay cold and you cannot settle, warm your feet first before reaching for the thermostat.
If you have done the temperature basics and still cannot drift off, the issue is often not the room. When you cannot fall asleep covers what to actually do on those nights.
FAQ
What is the best room temperature for sleep?
For most adults, a common target is roughly 60 to 67°F (16 to 19°C). There is no single perfect number, so use that as a starting range and adjust by a degree or two based on how you feel and your bedding.
Should I leave the air conditioning on all night?
It depends on the trade-offs. Leaving it on can keep the room steady, but it can also dry the air, over-cool the room, and raise your energy use. A timer or a thermostat schedule that eases off after you fall asleep is often a comfortable middle ground.
How can I sleep in summer without air conditioning?
Focus on airflow and humidity rather than the exact temperature. A fan, lighter and breathable bedding, a cool shower before bed, and closing blinds during the afternoon all help. In a real heat wave, staying cool is a safety matter, so do not try to endure dangerous heat to save energy.
Why can't I sleep when the room is cold?
When your hands and feet are cold, the body holds onto heat instead of releasing it, which can delay sleep. Warming your feet with socks or a hot water bottle often helps more than turning up the whole room.
What temperature is best for a baby's room?
Babies generally do a little warmer than the adult range, and comfort matters more than a fixed reading. This article is general guidance, not medical advice, so follow your pediatrician's recommendations for your child.
A note
This article is general guidance, not medical advice. Comfortable temperature ranges vary from person to person, and the numbers here are a starting point rather than a target to force. If you have ongoing trouble sleeping, a health condition, or concerns about temperature regulation, or if you are caring for an infant or an older adult, please talk with a qualified professional.
Related tools
- Evening Routine Builder: place a warm shower early and keep the last stretch cool and calm
- Sleep Calculator: when an overheated room shortens your sleep, check whether your wake-up time still fits
- Bedtime Calculator: work back from your wake time to set tonight's bedtime, then schedule the warm shower 90 to 120 minutes before
Related reading
- Evening Routine Guide: 60, 90, and 30-Minute Templates: where the warm shower and lights-down steps fit inside a fuller wind-down
- 30-Minute Wind-Down Routine: a short evening plan when you do not have much time
- Phone Before Bed: another common reason sleep feels lighter than it should
- Caffeine Cutoff Time Before Bed: the third evening factor worth getting right
- Why You Wake Up Tired After 8 Hours: when the hours look fine but the room or routine is working against you
- Sleep Cycles: The Truth About the 90 Minute Rhythm: what the lighter and deeper stretches of sleep actually are
- Cannot Fall Asleep: a calm playbook for nights when the room is fine but sleep will not come
Sources
- World Health Organization, Housing and health guidelines (recommended minimum indoor temperature)
- American Academy of Sleep Medicine (AASM) and Sleep Foundation, on bedroom temperature and sleep quality
- Centers for Disease Control and Prevention (CDC), on bedroom environment and sleep
- Cleveland Clinic, on the best temperature for sleep and how it changes with age