What Blue Light Really Does to Your Body: Sleep, Hormones, and Mitochondria (A Scientist Explains)

Blue light at night might be the real reason you cannot fall asleep, stay asleep, or wake up feeling rested. And it has almost nothing to do with blue light being "bad." Here is the part most people miss: blue light is not the enemy. During the day it is a nutrient your body actually needs. The problem is blue light at the wrong time, the "second sun" pouring out of your phone, your TV, and the LEDs overhead long after the real sun has set. Your brain reads that glow as midday, at midnight. ...