Sunlight triggers a cutoff of melatonin, bringing on wakefulness. {Indoor light-particularly the light from tablets and smartphones-can also suppress melatonin, but nowhere near as dramatically as sunlight.} This is why night shift workers who drive home in the morning through sunlight and then struggle to fall asleep may find relief by buying amber-lensed Bono-style glasses that block the sun's blue light wavelengths. NSMRL
( Mary Roach )
[ Grunt: The Curious Science of ]
www.QuoteSweet.com