i agree for leds, car displays and things like that, but for people who use their devices to looks at mostly calibrated pictures (photography/graphism/art/etc.) the warming displays functionality at night is not an option...
How about not doing color-sensitive work at night? "Night". Even only looking at biological systems, the body shifts to a very different regime during that time. Different hormones and all that, doing repairs and house cleaning. Humans don't come from a nocturnal line of animals.