Retrieved 18 August 2016. Cite web URL http://www.nhlbi.nih.gov/health/health-topics/topics/sleepapnea/signs Title What Are the Signs and Symptoms of Sleep Apnea? Source date July 10, 2012 Website NHLBI URL access date 18 August 2016 ↑ "Who Is at Risk for Sleep Apnea?".