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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 Nayana Ambardekar, MD on July 16, 2018
This tool does not provide medical advice. See additional information.
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