My 15 year old DD has to be in bed by 10.15 on school nights.She is allowed to stay up later on weekends and holidays and occansionly on schoolnights if there is a film she wants to watch on TV. Do you think this is reasonable. She says this is to early and her friends are allowed to go to bed when they want. She will be allowed to decide her own bedtime when she is 16 as her older sister does. My 13 year old is in bed by 9pm as she tends to get very tired.