It's not "bad" for you per se..
Blue light, or light frequencies that is on the higher end of the light spectrum suppresses our body's ability to produce Melantonin, the hormone responsible for sleep cycle..
I mean it only makes sense that our evolutionary bodies uses light as a function to determine sleep cycle since for millions of years, our hunter-gatherer ancestors rely on sunlight cycle to survive, day=awake and night=sleep. Since blue light only exist naturally from the sun (there were no LED in the days of our cave dwelling nomadic forefathers),
Since blue light makes one harder to fall asleep, the lack of sleep is bad for you. Blue light itself is not that bad, it's allowing it to fuck up our sleep schedule (i can say that here, blockchain rocks!) that's bad for you.
Please read regarding your scn, blue light and the fact that it is beginning to be seen as one of the worst disrupters of the human biology. While the science is there, it will still take the usual 15-30 years for people to realise how serious it really is.
@iamericmorrison I think the effect is already beginning to manifest itself now with later and later average sleeping time. It's going to be a social thing in the future too where the smart ones will have a system in place for them to not stay awake beyond healthy hours.. While the rest goes on scrolling spree till they literally can't stay up anymore.
Humans aren't meant to stay up at night and its messing with our hormones right now already. Best defense is the be aware of it and live a lifestyle that encourages early sleeping.