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National Institutes of Health: "What Causes Insomnia?" "What Is Sleep Apnea?" "Who Is At Risk for Sleep Apnea?” "How Is Insomnia Diagnosed?"
National Sleep Foundation: "Healthy Sleep Tips."
University of Maryland Medical Center: "Sleep Hygiene: Helpful Hints to Help You Sleep."
Hirshkowitz, M. Sleep Health, March 2015.
Reviewed by Carol DerSarkissian on July 21, 2016
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