Body clock may be to blame when tots fight sleep

By Lauran Neergaard

Published December 31, 2013 7:58am ET

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Body clock may be to blame when tots fight sleep — This handout photo provided by University of Colorado, Boulder, taken Dec. 20, 2013, shows University of Colorado, Boulder, student Karlie Johansen collecting a saliva sample from 3-year-old Anders Todd, as part of a study of sleep patterns in young children. In an earlier study, researchers reported that if young children continually struggle to fall asleep at night, it might be because their body clock is out of sync with their bedtime. (AP Photo/Miranda Fan, University of Colorado) | Miranda Fan

WASHINGTON (AP) — “Just one more story, please?” ”I need a glass of water.” ”Mom, I can’t sleep!”

When youngsters continually struggle to fall asleep at night, new research suggests maybe their body clock doesn’t match their bedtime.

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