Obstructive sleep apnea (sleep apnea) includes episodes of partial and / or complete closure of the upper respiratory tract during sleep, leading to a cessation of breathing lasting more than 10 seconds. Symptoms of obstructive sleep apnea include a feeling of fatigue, snoring, re-awakening, morning headache and excessive daytime sleepiness. The diagnosis is based on a history of sleep, physical examination and polysomnography.