14 yr DS1 goes to bed at 10 on a school night and I'm pretty relaxed during the holidays. Until about a year ago it was 9.30 on school nights and 10.30 in the holidays, but he is nearly an adult now, so I do feel during the holidays he needs to decide for himself. I even go to bed before him during the holidays sometimes (DH works away during the week)
OP, I think your DS needs to have some outside interests. I think it is so important for teenagers to have something they enjoy other than computer games or TV. DS1 is always out doing something. Right now he is doing a Kayak training weekend and next weekend he is on an aikido weekend. We don't force him to do these things, he chooses to. We do encourage it. He loves kayaking, aikido, biking and his beloved electric guitar He also gets togther with friends doing various things (although I suspect much of this summer will be spent with his girlfriend - bless him)
My theory is that you have treat teenagers like adults (wherever neccessary) for them behave like them.
I do think that as a result of the way we treat DS1, he is a very well balanced and very pleasant young man.