Teenagers and sleep.

What is the reason for teenagers' behavior of staying up late to play computer games?

Why is sleep important for teenagers?

When do most adults start to produce melatonin?

When do teenagers start to produce melatonin?

What effect does playing computer games and watching television late at night have on teenagers' sleep?

What are the consequences of not getting enough sleep for teenagers?

What have some schools in America done to address the issue of teenagers not getting enough sleep?

How did the schools notice the impact of starting classes later in the morning?

What is the main reason for teenagers' lack of sleep?