How it works
Your body has a clock inside it. Light tells that clock the time: bright light says it is day, and dim light at night says it is time to sleep.
But a bright screen near your face can say it is still day, and games and videos keep your mind busy.
While you sleep, your body grows, and sleep helps you remember what you learned. Kids your age need lots of sleep, more than grown-ups do.
Screens are not bad. The trick is switching off early. Many families switch screens off half an hour before bed, or longer.