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Study: Regular bed times help kids in the classroom

Wednesday - 9/4/2013, 7:46am  ET

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The amount of sleep each kid needs varies from child to child, the report says. (WTOP File)

WASHINGTON - It turns out a child's bedtime makes a big difference in how he performs in the classroom, according to a new study.

A study of 11,000 kids monitored at ages 3, 5 and 7 found that those who had irregular bedtimes scored lower on cognitive tests.

The effect was cumulative, researchers at the University College London found, according to a Yahoo! Health report.

The study found girls who didn't go to bed at a consistent time scored lower in all tests. Boys reported lower scores when they had irregular sleep times during certain ages.

In the study, the kids had to read a series of words on cards, complete number-based tasks and replicate design patterns.

The amount of sleep each kid needs varies from child to child, the report says.

However, the National Sleep Foundation makes these recommendations:

  • Newborn babies - 12 to 18 hours of sleep;
  • 1- to 3-year-olds - 12 to 14 hours of sleep;
  • Preschoolers - 11 to 13 hours of sleep;
  • 5- to 10-year-olds - 10 to 11 hours of sleep;
  • Teens - 8.5 to 9.25 hours of sleep.

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