▪︎The eye is not very good at blocking blue light.
Those blue light filters, like the Pixel’s “Night Light,” were designed to reduce a protein in your eye called melanopsin. That protein responds to the intensity of light, especially when that light is of a shorter wavelength, i.e. blue lights. When the screen is tinted yellow, the blue portion of RGB lights is lessened considerably.
The study found that warm, yellow light tricks your brain into thinking that it’s actually daytime. The warmer colors tell your body clock that it’s sunrise or sunset, in either case telling your body that it’s not quite time to go to sleep yet.