— Huffington Post (@HuffingtonPost) July 2, 2015
Scientists at the Sleep Disorders & Research Center at Henry Ford Hospital in Detroit found that consuming 400 milligrams of caffeine (equal to two to four eight-ounce cups of brewed coffee) six hours before bedtime reduced sleep by more than an hour.
The light that gadgets emit can suppress the sleep-inducing hormone melatonin.
The Fix: Dim the brightness of your device to its minimum and hold it at least 14 inches from your face. A Mayo Clinic study found that these two moves can cut light exposure to the point that it shouldn’t interfere with your sleep.