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4 Http://www.webmd.com/sleep-disorders/features/immune-system-lack-of-sleep#1 Http://www.academic.oup.com/ajcn/article/66/2/4464S/4655772
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6 Http://www.medlineplus.gov/ency/article/007165.html
7 Http://tuftsjournal.tufts.edu/2010/05_2/features/04/