But this isn’t what kids need, say researchers.

When children are eight or nine, most only need eight hours of sleep. But as they become teenagers, they need about nine and a half hours.

Those who don’t get enough sleep become moody or depressed, can’t remember things or concentrate. And they do poorly in school.

To help children get enough sleep, see that they:

• Set a reasonable bedtime and wake time. Be consistent throughout the week.
• Establish a bedtime routine—like reading or taking a hot bath before bed.
• Cut down on caffeine.
• Exercise daily. Make sure exercise is at least two hours before bedtime.

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