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<p>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.</p>

<p>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.</p>

January 1, 2014

Stories this photo appears in:

Body clock may be to blame when tots fight sleep
January 1, 2014 8 p.m.

Body clock may be to blame when tots fight sleep

WASHINGTON - "Just one more story, please?" ''I need a glass of water." ''Mom, I can't sleep!"