I send mine to bed at 9pm, but according to him, all his friends are allowed to stay up until midnight. Yeah, right! However, I do have to drag him out of bed in the morning to go to school. He naturally wakes up at about 9.30am. He doesn't usually get to sleep till about 10pm, but if I sent him to bed at 10pm, he wouldn't go to sleep till 11. So, 11.5 hours is what he seems to need - 10 is what he gets.