Most teens need 9.25 hours of sleep a night, so make it a rule and habit to turn off electronics and the lights by 10:30pm, then bump it to 10pm, then 9:45pm. That way, if you have to wake up by 7am you will get plenty of sleep. If you need to wake up earlier, then get to bed earlier. Not every teen needs this much sleep, so you can make changes so it’s right for you, but don’t get any less than 8.5 hours of sleep a night. You need at least this much.