Tip Your brain’s ancient survival settings think a cool, dark cave means “safe to sleep”—and you can hack that. Find out why setting your bedroom thermostat to “Polar Bear Chic” might be the shortcut to the best sleep of your life.
You’re not imagining it: Ever notice how it’s easier to sleep on a cool fall night than a sweltering summer evening? Our primitive brains were built to doze off in chilly caves, not air-conditioned suburbs. Cooling down your room—even by just a few degrees—can flip the sleep switch faster than you can say “hibernate like a bear.”