I try to avoid cellphones in bed but cold blue light is everywhere, on my Polar watch, baby monitor, my car’s dashboard. Need to start looking into next purchases and prefer stuff with warmer orange lights.
Harvard researchers and their colleagues conducted an experiment comparing the effects of 6.5 hours of exposure to blue light, versus exposure to green light of comparable brightness. They found that blue light suppressed melatonin for about twice as long as the green light and shifted circadian rhythms by twice as much (3 hours compared with 1.5 hours). And worse, it’s been linked in recent studies to an increased risk of obesity and some cancers.