> ...no competing theory that does have hard evidence has been proposed, so current behavior is actually the first rationalization. I think it would be even mo

> ...no competing theory that does have hard evidence has been proposed, so current behavior is actually the first rationalization. I think it would be even more reasonable to investigate WHY this is being discovered now rather than a long time ago. What has changed in the lives of teens now compared to 3 or 4 decades ago? I suspect one thing is a much higher percentage of "structured time". Teens today seem to have far more time obligations than my generation did. As a result, socializing and free-time ends up getting pushed to interstitial times, late at night _and_ online. Young people need unstructured time for ad-hoc socializing and discovering who they are and there is less opportunity for that now so it happens later at night when their obligations have been met and the time is their own. That's a simpler explanation than primate sexual urges.