Best Bedroom Temperature for Sleep: What the Science Actually Says

By The SNOOZ Editorial Team · Published May 18, 2026

If you wake up sweating in the middle of the night, kick the covers off and then pull them back on an hour later, or feel like you slept eight hours but still woke up exhausted, there's a good chance your bedroom temperature is the problem. Sleep specialists consistently point to room temperature as one of the most overlooked factors in sleep quality, and as the weather warms up, it becomes harder to manage.

Here's what the research and medical experts actually recommend for the best bedroom temperature for sleep, and how to keep your room cool when summer makes it hard.

What is the best bedroom temperature for sleep?

For most adults, the recommended range is 60 to 67 degrees Fahrenheit (15 to 19 degrees Celsius). This range is supported by sleep specialists across major medical institutions including Cleveland Clinic, the National Sleep Foundation, and the American Heart Association.

Within that range, around 65°F (18°C) is often cited as the sweet spot for most adults. Some people sleep better at the cooler end (60-63°F), others at the warmer end (65-67°F). Personal preference, bedding weight, and what you wear to bed all factor in.

In a May 2026 statement, Cleveland Clinic sleep specialist Brian Chen, MD explained the reasoning: when your body is too hot at night, your core body temperature can't drop to its lowest natural point, which is what your circadian rhythm is trying to do. That prevents you from getting the deepest, most refreshing sleep.

Why does temperature matter so much for sleep?

Your body's internal temperature follows a 24-hour cycle. It's typically highest in the early evening (around 6-7 p.m.) and drops to its lowest point during sleep, usually a few hours before you wake up. This temperature drop is part of how your body initiates and maintains sleep.

When you go to bed, your body releases melatonin (the sleep hormone) and starts pushing heat outward through your skin to lower your core temperature. This is why your hands and feet often feel warmer when you're falling asleep, blood flow increases in your extremities specifically to release heat into the surrounding air.

If your bedroom is too warm, this heat-release process gets blocked. Your body can't cool down enough, so you stay in lighter sleep stages, wake more often, and miss out on the deep, slow-wave sleep that's most physically restorative.

If your bedroom is too cold, the opposite problem occurs: your body has to work to stay warm, blood vessels constrict, breathing becomes shallower, and your cardiovascular system stays activated. Too cold is generally less disruptive than too hot (you can add blankets), but it's still not ideal.

How does temperature affect REM sleep specifically?

REM sleep, the stage where most dreaming happens, is particularly temperature-sensitive. Research has shown that both excessive heat and excessive cold reduce time spent in REM sleep, and heat is the bigger disruptor of the two.

This matters because REM sleep is when your brain consolidates memories, processes emotions, and does much of its restorative work. Cleveland Clinic sleep psychologist Michelle Drerup, PsyD has explained that maintaining a temperature in the 60-67°F range specifically helps preserve REM sleep stability throughout the night.

If you regularly wake up feeling unrested despite sleeping 7-8 hours, fragmented REM sleep from a too-warm bedroom is one possible explanation.

What's the ideal bedroom temperature for babies and toddlers?

Slightly warmer than for adults: 65 to 70°F (18 to 21°C) is the commonly recommended range for infants. Babies can't regulate their body temperature as well as adults, and their smaller bodies cool down more quickly.

However, overheating is a real concern for infants and raises the risk of sudden infant death syndrome (SIDS). The American Academy of Pediatrics recommends:

• Keep the room between 65-70°F when possible
• Avoid overdressing the baby for sleep
• Skip loose blankets and hats in the crib
• Use breathable sleepwear like a sleep sack rather than heavy pajamas

If you're using a sound machine in the nursery alongside a fan or AC for cooling, see our guide to safe decibel levels for infants for proper volume and placement.

What's the best bedroom temperature for older adults?

This is where the science has shifted recently. A 2023 study published in Science of the Total Environment tracked bedroom temperatures and sleep quality for 50 older adults and found that people aged 65 and over often slept best at temperatures between 68 and 77°F, somewhat warmer than the general adult recommendation.

The reason: as you age, your body's ability to regulate internal temperature decreases. Older adults often feel colder more easily and may need a warmer environment to feel comfortable enough to sleep deeply.

The same study found that once temperatures rose above 77°F, sleep efficiency began dropping by 5 to 10 percent, meaning more time tossing and turning, less time actually sleeping. So even for older adults, there's still an upper limit.

How can you tell if your bedroom is too hot to sleep?

Common signs your bedroom temperature is sabotaging your sleep:

• You wake up sweating or with damp sheets
• You toss and turn more than usual
• You frequently kick covers off and pull them back on
• You wake up multiple times throughout the night
• You feel unrefreshed despite a "full" night's sleep
• You take longer than 20-30 minutes to fall asleep
• You sleep better in hotel rooms than your own bed (often because hotels run colder)

If you're not sure what your bedroom temperature actually is at night, an inexpensive room thermometer or smart thermostat with night-mode reporting can tell you. Many people are surprised to find their bedroom is 4-5 degrees warmer than they thought, especially in upper floors of a home or in rooms with afternoon sun exposure.

How do you keep your bedroom cool for better sleep?

The good news: managing bedroom temperature doesn't usually require expensive equipment. The most effective adjustments are simple.

Adjust the thermostat before bed

Drop the temperature about 30-60 minutes before bedtime to give the room time to cool. A programmable or smart thermostat that automatically drops the temperature at night and raises it in the morning is the cleanest solution.

Use a fan

A fan helps in two ways: it moves air across your skin (which accelerates heat release through evaporation), and it produces continuous sound that masks sleep disruptions. The cooling effect of a fan can let you keep your thermostat higher without losing comfort, which is meaningful for both your energy bill and your sleep quality.

If you're already using a sound machine for noise masking, a separate cooling fan is a simple addition to your bedroom setup. For more on how fan sound and sound machines compare, see our guide to fan vs. white noise machine for sleep.

Choose lightweight, breathable bedding

Heavy duvets and synthetic fabrics trap body heat. In summer, switch to lighter weight blankets, cotton or linen sheets, and breathable sleepwear. Some people add a moisture-wicking mattress topper for extra cooling.

Block out daytime heat

Close blackout curtains during the hottest part of the day to keep the sun from heating up your bedroom. This is especially effective for bedrooms with west-facing windows.

Avoid caffeine and sugar before bed

Both caffeine and sugary foods can temporarily raise your body temperature and make it harder to cool down for sleep. Sleep specialists generally recommend avoiding both for at least three to four hours before bedtime.

Take a warm shower 90 minutes before bed

This sounds counterintuitive, but a warm shower or bath actually helps you cool down. After you get out, your blood vessels dilate to release the heat, which accelerates the natural temperature drop your body is trying to make anyway.

Should you sleep with a fan on all night?

For most people, yes. A fan provides both cooling and continuous masking sound, both of which support sleep. The main considerations:

• Direct airflow on your face can dry out your throat and sinuses overnight. If this is an issue, point the fan slightly away from you or use a fan-based sound machine that doesn't direct air at the bed.
• Dust circulation can affect people with allergies. A fan moves dust and pollen around the room, which may be a problem for sensitive sleepers.
• Energy use matters with traditional box fans (50-100 watts) but is minimal with efficient bedroom fans. Modern fan-based sound machines like the SNOOZ Original use a fraction of the energy of a standard box fan.

For a deeper comparison of using a fan versus a dedicated sound machine, see our guide to fan vs. white noise machine for sleep.

What if you can't control your bedroom temperature?

Not everyone has central AC, and not everyone can crank the thermostat as low as they'd like. For apartments without independent climate control, dorm rooms, older homes, or anyone trying to manage their energy bill, here are the most effective workarounds:

• Cooling pillow or pillowcase with phase-change materials or cooling gel
• Sleep with one foot outside the covers to release body heat (sounds odd but works)
• Frozen water bottle at the foot of the bed to cool the sheets
• Bedside fan on low, pointed at the body or across the room
• Damp washcloth on the forehead, neck, or wrists for short-term cooling when you're trying to fall asleep
• Cool shower right before bed if your home is genuinely too hot

The bottom line on bedroom temperature for sleep

If you're not sleeping well, your bedroom temperature is one of the first things worth checking. Aim for 60-67°F as an adult, slightly warmer if you have an infant or are over 65, and use a combination of thermostat adjustment, a fan, and lighter bedding to manage hot weather.

The science is clear that even a few degrees can meaningfully affect sleep quality, and the fixes are usually simple. Run a fan, adjust the thermostat, swap out a heavy duvet for something lighter, and see what happens. For most people, the difference in how rested they feel is noticeable within a few nights.