Okay so I know that night mode is supposed to filter out blue light that is bad for the eyes, but is it really more helpful than annoying? At night I do use it when I’m on the phone but it doesn’t make sense to keep it on during the day when it’s bright outside does it?
Using Planck's theory, the shorter the wave is, the more energy it carries. On day light, all these wave lenghts are present, including UV from sun. With no sun-light, your eyes aren't hit by those, so there's no need of using higher energy waves (that's exactly how night mode on iPhone works, using only lower energy waves).