Should there be a an enforced mandatory bedtime for a high-school student ? what do you think ?

I think it depends on the kid. My son is 16 and I make him head to bed around 10:30. He might not go to sleep right away, but he is off the computer and the tv is off. Since I go to bed around that time too (and it's just the 2 of us), he doesn't usually give me much trouble. He needs his sleep.