Being a night owl is artificial. It's virtually impossible for most of human existence because for most of human existence we didn't have strong lights at night

Being a night owl is artificial. It's virtually impossible for most of human existence because for most of human existence we didn't have strong lights at night. The most natural thing to do for a human is to sleep when it's dark and get up when it's light. The second best thing given that nobody does the above anymore is to sleep late and get up late. But make no mistake it is more "healthy" and "natural" to have classes early in the morning.