You probably already know that caffeine, blue light, stress, and unquiet environments prevent you from getting a good night’s sleep. If you don’t, here’s a recap: Caffeine blocks a receptor in our brain for adenosine, a substance that makes us feel sleepy. Blue light from screens and devices shuts down the production of melatonin, another substance that makes us feel sleepy. Stress kicks our arousal system into gear and prompts the pumping out of cortisol and adrenaline, which kills sleepiness. And unquiet environments jolt us awake, increase stress, and interfere with falling asleep in the first place.
4 Surprising Things That Can Keep You Up at Night
