Reality: The amount of sleep we need is different for everyone and changes as children grow older.
Typically, most children (ages 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. Many teens do not get enough sleep.
The Canadian Paediatric Society has a general guide on the amount of sleep children and teens need over a 24-hour period, including naps.