Simulated blue white daylight supresses melatonin

Computer and Phone Light Suppresses Sleep (study summary)

Blue light in the morning helps you stay awake. Blue light at night keeps you awake. Learn More
Blue light raises heart rate

460 nm Blue Light Heavily Supresses Melatonin (study summary)

Of all the blue light wavelengths, 460 nm has a particularly strong effect supressing melatonin. Learn More
Red light eye goggles

Red Light During Sleep Reduces Sleepiness, But Not Melatonin (study summary)

Wearing a red light mask while sleeping led to greater alertness upon waking, and better self-reported feelings of being awake. Wearing red light goggles upon waking also reduced sleep inertia, but not as much as the mask. Learn More
eReader at night causes sleep problems

Evening Electronic Book Light Damages Sleep (study summary)

Sujects using eReaders projecting lue light formed delays in their circadian clocks. They had an average 20% drop in their melatonin compared to non-eReader use nights. Compared to controls, eReader users took 10 minutes longer to fall asleep. Users had approximately 11 minutes less REM sleep. Learn More