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ACSM. Web. 02 Jan. 2011. <http://www.acsm.org/>.

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Parker-Pope, Tara. "Gene Mutation Tied to Needing Less Sleep." The New York Times. 14 Aug. 2009. Web.

"What Happens When You Sleep?" National Sleep Foundation - Information on Sleep Health and Safety | Information on Sleep Health and Safety. Web. 24 Oct. 2010. <http://www.sleepfoundation.org/article/how-sleep-works/what-happens-when-you-sleep