(CNN) - Chances are, if you have kids, you've had trouble getting them to bed.
But doctors are finding that having a set bed time can make a difference, especially when little ones get older.
Sleep is crucial for everybody, but especially for little ones because it's so important for growth, in addition to learning, concentrating in school and for good behavior during the day.
A recent study in the Journal of Pediatrics found that children who went to bed at irregular times were more likely to have behavioral problems by the time they reached elementary school.
Researchers looked at data from more than 10,000 children and their sleeping behaviors at ages 3, 5 and 7. They also looked at comments made by their mothers and teachers on the child's behavior.
They found that, as they aged, children who went to bed at a certain hour had fewer problems in school than those who had no set bedtime. And when parents switched their children to a more strict nighttime routine, the child's behavior improved.
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