The best bedroom temperature for sleep is between 60 and 67°F (15 to 19°C) for most adults. This range supports your body’s natural cooling process that triggers drowsiness and helps you stay asleep through the night. Going much above or below this window can disrupt the deeper, more restorative stages of sleep.
Why Your Body Needs to Cool Down
Your core body temperature starts dropping before you fall asleep, and the speed of that drop actually predicts how quickly you’ll nod off. This isn’t passive. Your body actively pushes heat from your core out to your skin, especially your hands and feet, where it dissipates into the surrounding air. Blood vessels near the skin’s surface widen to allow more blood flow to your extremities, which is why your hands and feet sometimes feel warm right before sleep even as your internal temperature falls.
A cool bedroom makes this heat transfer more efficient. If the room is too warm, your body can’t offload heat fast enough, and the whole process stalls. That’s why a hot room doesn’t just feel uncomfortable; it physically interferes with the mechanism your brain uses to initiate sleep.
How Heat Disrupts Deep Sleep and REM
Sleeping in a warm room doesn’t just make it harder to fall asleep. It changes the structure of your sleep in measurable ways. Heat exposure increases time spent awake during the night and reduces both slow-wave sleep (the deepest, most physically restorative stage) and REM sleep (the stage most important for memory and emotional processing). Humid heat is even worse, compounding these effects because sweat can’t evaporate efficiently to cool you down.
Cold exposure, by contrast, is far more forgiving. Studies using clothing and bedding found no significant difference in sleep quality across room temperatures ranging from about 55°F to 73°F (13°C to 23°C), as long as people had appropriate blankets. In practical terms, a room that’s a bit too cool is easy to fix with an extra layer. A room that’s too hot is a bigger problem.
The Range Shifts With Age
The 60 to 67°F recommendation works well for younger and middle-aged adults, but older adults appear to sleep best at slightly warmer temperatures. A study tracking sleep in people over 65 found that sleep efficiency peaked when nighttime room temperatures were between 68 and 75°F (20 to 24°C). When temperatures climbed just 9°F beyond that range, sleep efficiency dropped by 5 to 10%, a clinically meaningful decline.
This makes sense physiologically. As people age, the body becomes less effective at regulating temperature, circulation to the extremities decreases, and the amount of deep sleep naturally declines. Older adults are also more sensitive to heat disruption of REM sleep, even at mildly elevated temperatures. If you’re over 65, aiming for the low 70s rather than the low 60s is a reasonable starting point.
Safe Temperature for Babies
For infants, the recommended room temperature is 61 to 68°F (16 to 20°C). Overheating is a known risk factor for sudden infant death syndrome (SIDS), so keeping the nursery on the cooler side is important. Light bedding or a well-fitting sleep sack is enough at these temperatures. If you leave heating on overnight, keep it set no higher than 68°F (20°C). A simple room thermometer near the crib takes the guesswork out of it.
Hot Flashes and Night Sweats
If you experience hot flashes during the night, the standard recommendation of 60 to 67°F may not be cool enough during an episode. Lowering the thermostat a few degrees below your usual setting, layering bedding so you can easily push off a blanket, and keeping a glass of cold water on the nightstand all help. A bedside fan gives you on-demand cooling without making the entire room uncomfortably cold for a partner.
Warming Your Feet Helps You Fall Asleep Faster
This sounds contradictory in an article about keeping things cool, but wearing socks to bed can shorten the time it takes to fall asleep by about 7.5 minutes on average. Participants in one study who wore socks also slept longer overall, woke up fewer times during the night, and had higher sleep efficiency compared to those who went barefoot in a cool room.
The mechanism ties back to that core temperature drop. Warming your feet dilates the blood vessels there, which pulls more heat away from your core and speeds up the cooling process your brain needs to initiate sleep. Importantly, wearing socks didn’t raise core body temperature. It just made the redistribution of heat more efficient. If you keep your bedroom cool but your feet always feel cold under the covers, socks are a simple fix that has real data behind it.
Bedding and Sheets Matter Too
Your thermostat setting is only part of the equation. What you sleep under and on plays a significant role in how heat builds up or escapes around your body. Natural fibers outperform synthetics for temperature regulation. Cotton percale, linen, and modal are all breathable and wick moisture away from skin, which helps if you tend to sweat at night. Linen is particularly effective in warm climates because of its loose weave and natural cooling properties. Silk is another option that regulates temperature well in both directions.
If you and a partner disagree on temperature, or if you run hot despite a cool room, a temperature-controlled mattress pad is worth considering. In one study, men using a cooling mattress pad fell into deep sleep nearly 7 minutes faster than without it. The effects were more modest for women in the same study, but individual responses vary. These devices let you cool one side of the bed without affecting the other, which solves the common problem of couples with different temperature preferences.
Finding Your Personal Sweet Spot
The 60 to 67°F range is a starting point, not a rigid prescription. Your ideal temperature depends on your age, whether you sleep hot or cold, your bedding, your pajamas, and even your body composition. A practical approach is to set your thermostat to 65°F for a few nights, then adjust by a degree or two in either direction based on how you feel. If you’re waking up sweating or kicking off covers, it’s too warm. If you’re curling up tightly or waking with cold extremities, it’s too cool.
Keep in mind that temperature interacts with humidity. A room at 67°F with high humidity will feel warmer and more disruptive to sleep than the same temperature in dry air. If your bedroom tends to be humid, especially in summer, a fan or dehumidifier can make a noticeable difference without changing the thermostat at all.