there's lots of theories on this, to the point of having "blue light glasses".
however, mine is much more caveman like. during the day, the sun is up. at night, it is not, so it is dark and cold. man made fire. fire is good. fire is warm. light from fire is orange. man evolve using warm light at night. industry brings us blue light at night. blue light strange. makes things look harsh, unpleasant. caveman pushes button on magic rock that makes light back to warm color. caveman happy again.
however, mine is much more caveman like. during the day, the sun is up. at night, it is not, so it is dark and cold. man made fire. fire is good. fire is warm. light from fire is orange. man evolve using warm light at night. industry brings us blue light at night. blue light strange. makes things look harsh, unpleasant. caveman pushes button on magic rock that makes light back to warm color. caveman happy again.