Blue Light
Does Night Shift Actually Help You Sleep? What It Misses
Tested directly in 2021: Night Shift users slept no better. Your phone is one of six light sources, usually the smallest.
Amber vs Clear Blue Light Glasses: Which Helps Sleep?
One trial tested both: amber lenses added 30 minutes of sleep. The clear pair was the placebo. Physics explains why.
How Much Does Blue Light Suppress Melatonin? Lab Numbers
99% of adults, 90 lost minutes, 55% suppression: the measured lab numbers behind blue light and melatonin.