Cooler Nights, Deeper Sleep: The Link Between Temperature and Rest

A good night’s sleep is one of the most powerful tools for maintaining overall health, yet many people struggle to achieve it. While we often focus on bedtime routines, screen time, or even diet, one overlooked factor could hold the key to better rest: temperature. Science shows that even a small change in your sleeping environment’s temperature can have a profound effect on how quickly you fall asleep, how deeply you rest, and how refreshed you feel in the morning.

By creating the right thermal conditions, you can support your body’s natural sleep cycles and improve everything from mood to metabolism. It’s a surprisingly simple adjustment that doesn’t require expensive gadgets or complicated routines—just a little awareness and a willingness to fine-tune your sleep space.

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Imagine waking up every morning feeling refreshed, energized, and ready to tackle the day. It might sound like a distant dream, but the key to achieving this could be as simple as adjusting the temperature in your bedroom. Sleep is a fundamental aspect of our well-being, and while many factors can influence its quality, one often overlooked element is the temperature of your environment.

In this article, we’ll explore how a small change in temperature can make a big difference in your sleep, and provide practical tips to help you optimize your bedroom for better rest.

The Basics

Your body temperature naturally drops to prepare for sleep, and many experts say you should keep your thermostat between 60 and 67 degrees Fahrenheit to help facilitate this decrease.

But Chris Winter, MD, president of Charlottesville Neurology and Sleep Medicine in Virginia, tells Health that he thinks 65 degrees is ideal. “That doesn’t mean 66 or 67 is terrible, but a cooler environment usually lends itself to a better quality of sleep,” Dr. Winter tells Health.

Why Cooler Is Better.

By helping the body lower its core temperature, you’ll generally fall asleep faster. But that isn’t the case for everyone. Some people say they have an easier time falling asleep when the temperature in their bedroom is in the 70s, Dr. Winter says. “But if I were to measure the quality of their sleep in that warmer environment versus a cooler one, I would bet it would be better in the cooler environment.”

This may have to do with your body’s circadian rhythms, also know as your biological clock. Circadian rhythms are biological processes that repeat every day—such as the dip in core temperature at bedtime and then the temperature rise that happens as you wake up. Studies have shown that warm sleeping environments can interfere with circadian temperature regulation by preventing the body from reducing its internal thermostat, leading to poor sleep.

That doesn’t mean you have to shiver under the covers all night. Dr. Winter suggests keeping the thermostat low but layering on extra blankets if falling asleep in a cool room isn’t comfortable for you. Blankets are easy to push off in the middle of the night if you do get warm, he says, so you can continue to sleep through the night soundly without waking.

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Still Not Cold Enough?

If your room doesn’t feel cool enough at bedtime, Dr. Winter recommends investing in cooling bedding, such as PeachSkinSheets Night Sweats Sheet Set ($80; amazon.com) or the Tempur-Pedic Tempur-Cloud Breeze Dual Cooling Pillow ($169; amazon.com). Or try putting some pillow cases in the freezer and popping one on your pillow each night before bed. “If you keep your head cool, your body often follows suit,” he says.

The National Sleep Foundation also recommends keeping a cold pack or a glass of ice water next to your bed for cooling off during the night, in addition to wearing light, breathable-fabric pajamas (or sleeping naked), and using fans to help keep air flowing even when the air conditioning is on.

Whatever you need to do to get your bedroom temperature in the 60s, Dr. Winter says it’s worth it because it’s a game-changer when it comes to sleep quality: “If somebody said to me, ‘I have a friend who doesn’t sleep well. You know nothing about them. What one suggestion would you make that you think odds are would have the most impact on their sleep?’ I would say temperature.”

Improving your sleep doesn’t always mean overhauling your entire lifestyle. Sometimes, the smallest changes make the biggest difference. Adjusting the temperature in your bedroom to better support your body’s natural rhythms can unlock deeper, more restorative sleep and transform how you feel during the day.

If you’ve been searching for a simple yet effective way to boost your sleep quality, look no further than your thermostat. A cooler, more comfortable sleeping environment may be the secret ingredient your bedtime routine has been missing. Try it tonight, and you just might wake up to a whole new level of energy and well-being.