[raddan]

I am also curious about this. The best sleep I ever had was when I was teaching an early morning class. Part of my morning routine is a short run, so this meant I was regularly waking up at 5am. I fell asleep regularly at 9pm when I was on this schedule. I use a sleep band [1] to track sleep, and it was the only time when I've been able to consistently get "high scores" on it.

[1] https://www.garmin.com/en-US/p/1650098/

[irenaeus]

It's strange to me that adolescents are (or seem to be) wired to want to wake late and sleep late, since waking early and sleeping early is a predictor of a predictor of lower all cause mortality!