Retrieved 2016-08-18. Cite web URL http://www.nhlbi.nih.gov/health/health-topics/topics/sleepapnea/ Title Sleep Apnea: What Is Sleep Apnea? Source date July 10, 2012 Website NHLBI: Health Information for the Public Publisher U.S. Department of Health and Human Services URL access date 2016-08-18 1 2 "What Are the Signs and Symptoms of Sleep Apnea?".