A new study has indicated that consistent bedtime routines for 4 year olds,  result in higher scores in receptive and expressive language, phonological awareness, literacy and early math abilities.  The American Academy of Sleep Medicine recommends that 4 year olds get at least 11 hours of sleep per night.  This study had a sample size of approximately 8000 children!  
Motor skill development was not assessed but that would be another interesting research study.  I would hypothesize that a lack of sleep results in a lack of coordination, precision, grading of movements and decreased safety awareness in children.  
Reference: Medical News Daily.  Consistent Bedtimes, Intentional Parenting Practices, Linked To Better Language, Reading And Math Skills In Preschool Children.  Retrieved from the web on 6/7/2010 from http://www.medicalnewstoday.com/articles/191038.php
 
 

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