It's pretty well studied that most teenagers stay up late.
My freshman year of high school my school was under construction so I was bussed across town. Which meant I had to wake up close to 5am. I don't remember staying up especially late, but I was perpetually tired. Id sleep on the bus both ways.
In college I had a semester when I had a 5am class. I found it much easier to stay up all night and crash after than to wake up for class.