What's the Best Temperature for Sleep?

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Written by Jill Zwarensteyn, Senior Editor

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The Best Temperature for Sleep

Age	Fahrenheit	Celsius
Adults	60-67 degrees	15-19 degrees
Babies and Toddlers	65-70 degrees	18-21 degrees

For most adults, the best temperature for sleep is 60 to 67 degrees Fahrenheit (15 to 19 degrees Celsius).¹

However, this will also depend on personal preferences. Some people naturally sleep hot, and others sleep cold, so it’s perfectly normal to go below or above these recommended numbers to what makes you feel most comfortable.

The best temperature for a baby’s room should be slightly warmer, around 65 to 70 degrees Fahrenheit (18 to 21 degrees Celsius).¹

We spoke to Dr. Kiran Dintyala about the importance of room temperature for when we sleep. He said that at night our core body temperature begins to fall a couple of hours before bedtime to help prepare us for sleep. If the room you are sleeping in is too hot or cold, it could affect your body’s thermoregulation system and keep you from achieving quality sleep.

How Does the Ideal Sleep Temperature Change as We Age?

You’ll notice in the above table that babies and toddlers are recommended to have a slightly higher and more narrow temperature range for sleep than adults. Babies cannot adapt to temperature changes as well as adults, and they can lose their body heat up to four times faster.² By allowing babies to remain at a comfortable temperature, they can conserve their energy, which is especially important if they’re battling an illness or are premature.

While adults can adapt to temperature changes better and sleep in slightly cooler environments, newer research suggests that older adults, specifically, may benefit from a slightly warmer temperature. In the longitudinal study, it was found that older adults had more efficient and restful sleep when the temperature was between 20 degrees Celsius (68 degrees Fahrenheit) and 25 degrees Celsius (77 degrees Fahrenheit).³

Achieving the Best Temperature for Sleep

How to Keep Your Bedroom Cool

If your bedroom feels too warm for you to sleep well, there are steps you can take to help bring down the temperature.

Close the blinds during the day – Keeping the hot sunlight out of your room during the day should help it stay cooler overall. This is especially important for those who work overnight and need to sleep during daylight hours.
Adjust the windows according to the outside temperature – If it’s hot outside, leave the windows closed to keep the warm air out of the room. Conversely, if it’s cooler outside, open your windows to let the breeze in.
Sleep at the lowest level – Heat rises, so if you live in a multi-story home, try sleeping on the bottom floor.
Use a fan – You can use a fan to keep the air circulating, but make sure it’s not pointing directly at your body since this could result in sore muscles and headaches.

How to Regulate Your Temperature for Sleep

Just like it’s important to regulate your room temperature for a good night’s sleep, it’s also important to keep your body cool. This is because a drop in core temperature at night signals your body it’s time to sleep.⁴

Below are some ways you can cool your core temperature before and during sleep.

Use cooling bedding and accessories – Temperature-regulating sheets and pillows, as well as a good cooling mattress, can help you stay comfortable. However, different mattress types and materials have varying thermal properties. Memory foam mattresses typically sleep much hotter since this type of foam traps heat (unless they contain cooling gels), while hybrid beds or innerspring mattresses usually fare better due to improved airflow from the coils.

Sleep in breathable pajamas – Look for pajamas made with cooler fabrics like cotton, linen, and bamboo.

Avoid vigorous exercise just before bed – Exercise increases your body temperature, and according to research, vigorous exercise within one hour before bed could impact the time it takes to fall asleep.^{5, 6}Instead, try working out earlier to improve your sleep.

Take a warm shower – This might seem counterintuitive, but taking a warm shower or bathone to two hours before bedtime can help lower your core temperature and improve sleep.⁷ Learn more about showering before bed and its impact here.

Limit screen time – Our phones, tablets, computers, and televisions emit a blue light that inhibits the production of melatonin, an important hormone for sleep.⁸ Further, melatonin production is correlated with decreased body temperature at night to help facilitate sleep.^{4, 8} It is recommended that screens be turned off 1-2 hours before bed.⁹

Learn more: Best Cooling Mattress

How to Maintain The Best Sleep Temperature During The Winter

During winter, especially in northern states where temperatures get near or below freezing, you may need to keep the room slightly warmer to accommodate the significant nighttime temperature drops. Like the other seasons, the ideal sleep temperature in winter for adults is 60-67 degrees.

Some people may find it harder to fall asleep during winter, especially if they tend to run cold, so here are a few tips to help keep warm:

Layer up – Wearing multiple layers is a simple and effective way to keep your body warm during winter. You should also consider the fabric of your pajamas since some materials are naturally cooling and may not be the best for the winter. In this case, look for fleece or wool pajamas for extra warmth.
Use extra blankets – Placing an extra blanket or two over you at night should help you warm up quickly. You might also consider investing in an electric blanket, which is a blanket that contains an electric heater inside of it. However, we recommend checking with your doctor before using one since they may not be safe for everyone.
Wear socks – We lose a lot of heat through the feet, which means keeping them insulated can help lock in warmth. Thicker wool socks can be great for cold winter nights.
Use a hot water bottle – A hot water bottle can make your bed warm within minutes. You can use it to warm your feet, stomach, or any other area where you feel cold.
Drink hot tea – Having hot tea before bed can warm you up and help you wind down.
Invite your pet to bed – While not everyone likes to sleep with their pet, they can be sources of heat if you’re experiencing a power outage or freezing temperatures during the winter months.

How Temperature Affects Sleep

Body Temperature

As mentioned, core body temperature plays a role in sleep. Normally, a person’s body temperature fluctuates during the day but only by 1 or 2 degrees.¹⁰ This is known as thermoregulation, the body’s ability to maintain a certain internal temperature.¹¹

Our body temperature drops around two hours before bedtime to help facilitate sleep.¹² The circadian rhythm, our body’s internal clock, controls these temperature fluctuations, among many other important physiological patterns.

Research has found, though, that as we age, our thermoregulation abilities aren’t as strong.¹³ Thermoregulation is important for sleep onset, and with many adults reporting worse sleep as they get older, there may be a connection.¹⁴ This is also why the elderly are considered more vulnerable when it’s extremely hot or cold out.¹³

That being said, it’s important to note that while diminished thermoregulation may play a role in sleep worsening with age, there are other causes of sleep problems in older adults, including an increased prevalence of sleep disorders.¹⁵

Sleep Temperature FAQs

Is 72 degrees a good sleeping temperature?

72 degrees may be slightly too warm for babies and adults, but it may be a good temperature for some older adults.^{1, 3}Since the temperature is especially important for babies’ health, you can also check with their pediatrician for additional guidance.

Why is sleeping in a cold room better?

Sleeping in a cooler room is better because it can help support sleep onset. “Cooler rooms promote sleep by dropping our core body temperature sooner, and a drop in body temperature coincides with bedtime. When we use fans and air conditioning, it cools the body down faster and promotes sleep,” said Dr. Vintyala.

Does your body temperature rise when you sleep?

No, just the opposite; your core temperature decreases when you sleep.16 About two hours before you go to sleep, your body temperature cools and this lasts until you wake up. However, your sleep environment, diet, and other medical conditions may make you feel warm. Plus, your skin temperature rises at the same time your body temperature decreases, which could cause you to feel warmer.16

What temperature is too hot for a baby to sleep?

The ideal temperature range for a baby to sleep in is between 65 and 70 degrees Fahrenheit (18 to 21 degrees Celsius).1 Rooms that exceed this temperature range can be too warm for babies, particularly if they have heavy clothing or multiple layers of clothes or blankets.17

Babies can’t regulate their internal temperature as well as adults, and warm rooms can increase their risk of sudden infant death syndrome (SIDS). A simple way to gauge if a baby is too hot is to check to see if their skin feels hot to the touch.17

Last Word of Advice

While an ideal room temperature is helpful for sleep, it’s one of many ways you can improve your sleep quality. Practicing good sleep hygiene, investing in quality bedding and the best mattress, and consulting health professionals for more serious conditions affecting your sleep will also be important steps toward more restful nights.

The Advisor Says

If you overheat at night, here are some inexpensive ways to help keep you cool: sleep in breathable pajamas, take a warm (yes, warm) shower before bed, and buy cooling sheets and pillows.

Jill Zwarensteyn

Senior Editor

About Author

Jill Zwarensteyn is the senior editor for Sleep Advisor and a certified sleep science coach. She is enthusiastic about providing helpful and engaging information on all things sleep and wellness.

Combination Sleeper

Education & Credentials

Certified Sleep Science Coach

References:

“What’s the Best Temperature for Sleep?”. Cleveland Clinic. 2021.
“Warmth and Temperature Regulation”. Children’s Hospital of Philadelphia. Webpage accessed April 25, 2024.
Baniassadi, Amir., et al. “Nighttime ambient temperature and sleep in community-dwelling older adults”. Science of the Total Environment. 2023.
Harding, Edward C., Franks, Nicholas P., Wisden, William. “The Temperature Dependence of Sleep”. Frontiers in Neuroscience. 2019.
Damatto, Ricardo Luiz., Mariano Cezar, Marcelo Diarcadia., Portugal dos Santos, Priscila. “Control of Body Temperature during Physical Exercise”. Journal of Brasilian Society of Cardiology. 2019.
Stutz, Jan., Eiholzer, Remo., Spengler, Christina M. “Effects of Evening Exercise on Sleep in Healthy Participants: A Systematic Review and Meta-Analysis”. Sports Medicine. 2019.
Haghayegh, Shahab., et al., “Before-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysis”. Sleep Medicine Reviews. 2019.
“Blue light has a dark side”. Harvard Health Publishing. 2020.
Pham, Hue Thi., et al. “Electronic Device Use before Bedtime and Sleep Quality among University Students”. Healthcare. 2021.
“What is a Normal Body Temperature?”. Cleveland Clinic. 2021.
Osilla, Eva V., et al. “Physiology, Temperature Regulation”. StatPearls. Last modified July 30, 2023.
Harding, Edward C., Franks, Nicholas P., Wisden, William. “Sleep and thermoregulation”. Current Opinion in Physiology. 2020.
Balmain, Bryce N., et al. “Aging and Thermoregulatory Control: The Clinical Implications of Exercising under Heat Stress in Older Individuals”. BioMed Research International. 2018.
“Aging changes in sleep”. Medline Plus. Last modified July 21, 2022.
Tatineny MD, Prathusha., et al. “Sleep in the Elderly”. Missouri Medicine. 2020.
Szymusiak, Ronald. “Body temperature and sleep”. National Library of Medicine. 2018.
“NIH alerts caregivers to increase in SIDS risk during cold weather.” National Institutes of Health. 2010.

What’s the Best Temperature for Sleep?