>>76492745
It's genetic as far as scientists can tell
In the wild, it was beneficial to have some people up and some asleep at different times, if you had a group of hunter-gatherers, there would be some people up keeping watch at pretty much any point all night, with all of them just doing their natural sleep rhythm, not to mention biphasic sleep.
tl;dr reddit-tier tism, it's just how you're wired, and night owls have always been fucked in industrial society
