One of the many fascinating facts I learnt from Matthew Walker's "Why We Sleep" is that the biorhythms of teenagers are shifted to later hours compared to those of adults in all human cultures of the globe, even in those rare societies hardly affected by technology. In evolution this was likely beneficial to make it easier for teenagers to socialize among themselves without adult disturbance, which was necessary to d…
This sounds like of a 'just so' story, as evolution is not usually considered to act at the group level, but instead at the individual level: https://en.wikipedia.org/wiki/Group_selection And some evolutionary biologists, like Dawkins, argues that it really acts on genes rather than the individual. So, I might be missing some of the claim, but I find it unlikely that teenagers would stay up later to be away from adul…
You can still get completely unselfish individual traits out of selfish gene selection (like the entire chapter on runt gene selection). It looks like group selection, Dawkins only argues that the mechanism is selfish genes.
Even he seems to have forgotten he wrote about that though.