I think I posted in another thread....my teens get 9-10 hours of sleep regularly. They can handle 2-3 days with less but then the effects are very noticeable. Their attitudes devolve into what might be considered 'normal' for other teens but is not normal for my kids. They can tell that they have a harder time focusing in school.
It's odd to me that many parents don't consider the amount of sleep their kids get as having an impact on their behavior, attitude and ability to perform at school....it's just common sense. An hour or so after they drag the kid out of bed the kid doesn't look sleepy anymore but that doesn't mean they got enough sleep. The first clue is if you have to
drag them out of bed every morning...they didn't get enough sleep.
On a side note...my son read somewhere that you can sleep for just two hours a day if you take naps at 4 hour intervals. Somehow he thinks that he will be able to stay up all night playing video games....or maybe I can get him to do laundry and mopping.
I told him he had to wait for summer to try it but even if it works, by the time he gets fully adapted to the program it will be time to think about going back to school and he would have to retrain himself to sleep at night. They don't allow power naps in high school, lol.