K.,
If you read the research on teens and brain chemistry you will see that the same schedules that worked when they were younger do not make sense now. Teens tend to do better when they stay up later and sleep later. However, that isn't always the real world and it is our job to help them learn to function in the real world.
I have 5 children (18, 17, 16, 14, and 12) - two are steps and three are mine. We have never had a set bed time. Instead, I have taught them to listen to their bodies. If they stay up too late one night, they pay for it the next day and they then adjust by going to bed earlier that night. I believe that I am raising them to be adults, not children, and I think if we control every thing they do, then they won't learn to self-regulate, and there will be a big rebellion (without the necessary coping skills) when they are eventually on their own. In our house, afternoon naps are not allowed. Several of my kids are athletes, so they are basically exhausted by the time they get home and actually go to bed earlier than I would expect. A couple also have jobs in breakfast restaurants, and they get up early in the mornings without prompting from me. I think they realize that sleep is a necessary thing and something they need to plan for but not something we will battle over. Again, I am looking towards the way they will need to behave as adults...get enough sleep to meet your responsibilities the next day.
One of my children (a stepson, now 16) came to live with us last year. He had been living with his mom who was very controlling about bedtime. She claimed he was really hard to get up in the morning and that's why she insisted on a 9pm bedtime. He used to be in bed but would lay there for hours because he wasn't tired. I talked to him about it and I told him my philosophy. He liked it (sounded like fun!) but I also told him that I wouldn't be yelling at him to wake up...that it was up to him and he'd suffer the consequences if he overslept. It took a few months (and some missed busses), but he now uses an alarm clock on his own and gets up with no problem. He and his brothers (my sons) came up with a shower schedule and they help each other wake up so no one is late. I stay out of it and it is working for us! I think his mother is surprised because she was sure that the morning wakeup would be the issue that got him sent back to her...but I have not had a problem with him at all!
Now, regarding the gaming...that is an entirely different issue. We actually do limit the amount of time that can be spent on the Xbox Live and the computer. We do that by only "checking out" the plugs at certain times. My kids would be on those machines all day and night if they weren't regulated, and I do think that the Internet can be a dangerous place. All of our computers are out in the open where we can always see them (none in bedrooms) and everyone knows that we are watching. When the kids say, "Don't you trust us?" we reply, "We trust you, but we just don't trust everyone else out there". Also, "Trust, but verify!"
I know every family and child is different, but this is what has worked for us. Hope it helps. And, good luck...raising teens can make you crazy!!! However, we will blink and they will be gone, so I am really trying to remind myself to appreciate every minute...challenging as that is at times!
ghr