I heard one theory that in general older people wake up earlier and younger people stay up later as a way that a group of people could watch the village 24/7.

I heard one theory that in general older people wake up earlier and younger people stay up later as a way that a group of people could watch the village 24/7. I can confidently say that multiple years of waking up early as a high school student did nothing to make me a morning person. 10-15 years later I find it more difficult to sleep in to 12-1pm when given the opportunity. As a kid, I seem to remember my grandmother always waking up obscenely early. I feel like I've watched my mother transition from a "normal" morning person who will sleep in an hour or two extra on the weekend to waking up obscenely early consistently.