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Can't Sleep? What to know about insomnia.
National Sleep Foundation
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Accessed May 15, 2013.
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. Updated April 11, 2013. Accessed May 15, 2013.
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What are the signs and symptoms of insomnia? National Heart, Lung, and Blood Institute website. Available at:
. Updated December 13, 2011. Accessed May 15, 2013.
Your guide to healthy sleep. National Center on Sleep Disorders Research. National Heart, Lung, and Blood Institute website. November 2005. NIH Publication No. 06-5271. National Heart Lung and Blood Institute website. Available at:
. Accessed February 11, 2009.