I’m a firm believer that a lot of the reason that people have troubles is that we are no longer on a natural sleep cycle because we have imposed an unnatural 8 hours at night as the standard.
Traditionally there was something, I think it was called a False Morning, where if you went to bed when the sun went down you would wake in the middle of the night and then sleep again after an hour or so. I read something where most colonists would use this time to do some reading in bed. I’m trying to find my references, but so far no luck.
It’s called first and second sleep.
Interesting.