> reduce harmful blue light
enough studies and randomized control trials have been conducted, it is conclusively shown that blue light emitted from household devices does not interact meaningfully with sleep. metareview CRD420251034611 "non-significant reduction in sleep onset latency" means blue light has been conclusively observed to not delay sleep - it doesn't mean that blue light has not yet been observed to delay sleep, we instead know conclusively that it does not. even better, a registered trial one: https://clinicaltrials.gov/study/NCT01855126 - RCT where shining a bunch of blue light on old people's eyeballs didn't help them stay awake longer (going to bed too early is actually a more common clinical issue than staying up too late). well if it can't keep people awake, it doesn't keep them awake.
it's a great interview question though. "does blue light from screens cause sleep delay?" it doesn't. why do so many people think it does? why suffer with a piss colored screen?
My erstwhile psychiatrist was completely obsessed with blue light. That, and caffeine, she told me to cut them out. She insisted that staring at a screen late at night, and just prior to sleeping, was my undoing.
And to a certain extent, she was right, but it was not "the blue light" per se that was damaging my psyche. Rather, it was the stuff within the light that was getting me agitated and angry. It was the disputes on Wikipedia, the social media arguments, the ragebait I found everywhere, the F.U.D. leading to my paranoia and rebellion and loss of trust.
It's like people who say "5G is harmful to our brains" -- well, yes, because whatever is being transmitted over that 5G is harmful, like porn or social media -- not the mere frequencies themselves!