I cannot say I follow. You acknowledge that blue light does affect our brains and sleep patterns, but then dismiss a solution which limits the amount of blue l

I cannot say I follow. You acknowledge that blue light does affect our brains and sleep patterns, but then dismiss a solution which limits the amount of blue light while toting an alternative which also acts to reduce the amount of blue light (brightness & distance). Brightness is meant to apply evenly across the entire color spectrum of a display (it doesn't in reality but that is a convenient fiction without getting into the weeds). Color filters on the other hand reduce the luminosity of only blue light which can be independently measured (see the link). I know plenty of people who use f.lux and tons more who use Night Shift on iOS devices. My wife is one of them, wakes up in the middle of the night and uses her phone, goes back to sleep a lot sooner after they added Night Shift than before. Obviously all anecdotes are anecdotes but study after study have shown that blue light negatively impacts sleep, and blue filter glasses have been shown by at least one Harvard study to help aleve the impact.