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18.04.2007 / , , , . , , , . , , .
, \Auburn University -\Notre Dame University, , , , , - .
Child Development. , - \Northwestern University , 8-13- . , . : 36% 30%.
, 10 ( ), 14- - 8.5 , 16% . \National Sleep Foundation 5-12- 10-11 , - 8-9 .
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