The amount of sleep we need is different for everyone and changes as your child grows older.
Typically, most children (aged 5-13) need between 9-11 hours of sleep a night. Most teens need around 8-10 hours of sleep a night to function at their best. And most teens tend not to get all of the sleep they need.
The Canadian Paediatric Society has produced a general guide on the amount of sleep children and teens need over a 24-hour period, including naps.