medlineplus.gov/ency/article/000811.htm Obstructive Sleep Apnea (OSA) from MedlinePlus Sleep apnea Obstructive sleep apnea - adults obstructive sleep apnea syndrome U.S. National Library of Medicine medlineplus.gov/ency/article/000811.htm Obstructive sleep apnea - adults obstructive sleep apnea syndrome obstructive sleep apnea (OSA) Obstructive sleep apnea - adults medlineplus.gov/ency/article/000811.htm Obstructive sleep apnea obstructive sleep apnea tongue to block your airways obstructive sleep apnea OSA Sleep apnea obstructive sleep apnea syndrome