[Sleep apnea syndrome]

Sleep Apnea Syndrome is an understimated disease. We describe its diagnostic criteron and principal epidemiologic data. After a brief rememory about sleep and respiration, its physiopathologic consequences [especially respiratory, cardio-vascular and cerebral] were detailed. The diagnostic of its different clinical presentations is suspected clinically but confirmed by polysomnography. His treatment, usually based on the CPAP, permits to prevent its complications