It’s absolutely true that a lot of modern-day problems with being tired come from bad sleep habits. What I’m talking about is a real phenomenon that isn’t being in front of a screen too close to bedtime. If anyone wants to know more, here’s a 3-minute video from AsapSCIENCE about what research shows.
I think it’s more flexible than you think. In my single 20s I was a night owl because I stayed up late playing video games and got satisfaction out of that. Now in my 40s I’m up at 5am because that’s when my family is still asleep and no one needs me for anything, and that’s a nice if not rare feeling.
I think I’m mostly up at night because it’s nice and quiet. And I don’t get bothered while doing things.
I could see myself waking up at 5 for the same reasons.