Or you know have them go to bed at 10 instead of let the play video games until 2am.
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…
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.