Just as a sort of tangent to this - it used to be normal (apparently all over the world) for people to wake up after a few hours, get up and do stuff for a while, then go back to bed. Basically, there were 2 sleep periods each night.
BBC has a rather long and overly detailed article about it: https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep
Maybe all of us waking up at 2:00 or 3:00 is a remnant of that?
Cool. Understood. Thank you.