Symptoms of obstructive sleep apnea vary from person to person, some mild and some more serious. Learn how to identify the signs and symptoms of sleep apnea. Sleep apnea involves repeated pauses in breathing during sleep, leading to reduced oxygen levels and symptoms like daytime sleepiness and loud snoring; the most common form, obstructive sleep ... Sleep apnea is a common condition that occurs when your breathing stops and restarts many times while you sleep. Learn about the causes, symptoms, and treatments of sleep apnea. Sleep apnea is a condition that causes repeated cycles of breathing interruptions during sleep. If left untreated, sleep apnea may lead to dangerous health complications related to oxygen deprivation.