Why You Can’t Fall Asleep in the Summer


There’s nothing more frustrating than slipping into a set of hot sticky sheets and tossing and turning all night in a warm bedroom. As it turns out there is a reason your body sleeps poorly in a hot bedroom. It’s a smaller temperature incline or the difference between your core body temperature and the room temperature that can cause a sleepless night.

The optimal slope is the difference between your core body temperature 98.6° F and about 68° F the temperature sleep experts say provides an optimal sleep environment. As part of the body’s natural rhythm our core temperature drops about half a degree at night signaling bedtime. And it seems that a cooler bedroom helps to make this dip happen.

No need to worry

But you don’t need to sacrifice a good night’s sleep just because you can’t crank up the A/C.  There are other ways to facilitate internal heat loss and cool down. Research shows that engaging in activities that increase skin temperature actually help to cool you down. Warming the skin hastens internal heat loss by dilating blood vessels close to the skin. This allows for the swift release of body heat and a lowering of core body temperature, in turn promoting sleep.

Keep the blinds closed. Though a sun-drenched room sounds lovely, in reality it can turn into an oven during the summertime. To keep the room cooler, simply close the blinds during the day, Gehrman says. Blocking out sunshine and heat means a cooler atmosphere when it’s time to sleep.

Eat a small meal. Eating a feast right before hitting the hay kicks your metabolic system into high gear digesting calories. And expended energy raises your core body temperature. Gehrman suggests curtailing eating within an hour-and-a-half to two hours before bed—if you’re hungry, try sticking to a piece of fruit, a small bowl of cereal, or some cheese and crackers to keep your metabolic rate and body temperature in check so you’ll still feel sleepy.

Get a dehumidifier. The humidity level rises during heat waves. Which adds to the discomfort level of a room because sweat accumulates on your skin. Decker says using a dehumidifier squeezes the moisture out from the air making it feel less heavy so your sweat can actually evaporate into the air.

Take a hot bath. This seems counterintuitive, but Gehrman says to take a hot bath before bed. Upon getting out. If your skin temperature is hotter than the room you’ll experience a drop in body temperature as heat transfers out. And that’ll help you to feel sleepy. If you have a newborn babies’ thermoregulatory systems aren’t as efficient as adults’, so this is an easy way to keep your child cool.

Surround yourself with breathable fabrics. If you’re not comfortable stripping down, make sure your pajamas are made from light and breathable fabrics like cotton, hemp, and linen. Have a foam mattress top or pillow? Decker says to put it away. Foam absorbs heat, making you feel like you’re sleeping in a hotter bed.

Stick your feet out of the covers. The body dissipates heat through the scalp, skin, and soles of our feet—anywhere with lots of blood vessels where heat can be released. Decker says sticking your feet out from under a blanket allows you to trap and direct heat outwards.

Sleep in the basement. Though it’s common sense by now, it’s still worth repeating. Heat rises, so if you live in a multi-floor house and your bedroom is on the fourth floor, you can count on the heat being settled there by the time you go to sleep. Gehrman says the basement or the first floor will be the coolest in the house, so sleep there if you can.