Because teens have a natural tendency to fall asleep later: https://www.ncbi.nlm.nih.gov/books/NBK222804/#:~:text=Research%20findings%20suggest%20that%20changes

Because teens have a natural tendency to fall asleep later: https://www.ncbi.nlm.nih.gov/books/NBK222804/#:~:text=Research%20findings%20suggest%20that%20changes,to%20as%20sleep%20phase%20delay https://www.ncbi.nlm.nih.gov/books/NBK222804/#:~:text=Resear... Sure, it is possible to have them go to bed earlier, but you're fighting biology