I don't think you should be downvoted, but there are parts missing to your comment. Teenagers have more distractions than ever, so it's easier to stay awake later. Teenagers also do less exercise than they have in the past. Just going outside and running around with friends is often a thing of the past.
Whenever someone tells me they have a hard time going to sleep, my first question is always to ask if they exercise. I rarely stayed up past 10pm, much less past midnight as a teenager because my friends and I were getting up early to surf, ski, skate, play football, basketball, baseball, etc... By the time 10pm rolled around I was dead tired and ready to sleep. And on days I had to work after school, I got home around 10 and would literally pass out.
I know the environment is different, but my experiences make me cautious to say 'all teenagers' have different rhythms or want to stay up all night because of something biological.
To add an anecdote, when I was a teenager I was on varsity track which meant 8 mile warm up runs, followed by 2 hours of practice, with 1 hour of weights afterwards.
Then I would head over to theatre which gave to more hours of backstage construction work.
Despite all that 'exercise', I still stayed up till 1am at a minimum, and sometimes didn't fall asleep till 3am.
So anecdotally, what worked for you, didn't work for me as a teenager.
My 15 year old son has had incredible difficulty going to sleep at a reasonable hour until recently when he started running with me. Now his problem seems to be gone. Go figure.
Teenagers are near their peak physical capability, yet most get very little physical activity.
Whenever someone tells me they have a hard time going to sleep, my first question is always to ask if they exercise. I rarely stayed up past 10pm, much less past midnight as a teenager because my friends and I were getting up early to surf, ski, skate, play football, basketball, baseball, etc... By the time 10pm rolled around I was dead tired and ready to sleep. And on days I had to work after school, I got home around 10 and would literally pass out.
I know the environment is different, but my experiences make me cautious to say 'all teenagers' have different rhythms or want to stay up all night because of something biological.