Objective : What the mean of obstructive sleep apnea ? Diagnose obstructive sleep apnea by using polysomnography and scoring by using last update of AASM. Overview of polysomnography. What are the type of sleep apnea (obstructive. central . mixed ) What are the symptoms , cause and risk of sleep apnea ? Impact sleep apnea on school performance. COVID 19 and obstructive sleep apnea? Last updated for treating the sleep apnea ( PAP , UPER AIRWAY STIMULATION , UPPP , positional ) Method : Polysomnography, also called a sleep study, is a comprehensive test used to diagnose sleep disorders. Polysomnography records your brain waves, the oxygen level in your blood, heart rate and breathing disorder. Polysomnography provide a great deal of information about your sleep the sleep apnea or another sleep-related breathing disorder . Polysomnography technique: You may be advised to avoid drinks or food containing alcohol or caffeine during the afternoon and evening before polysomnography. Alcohol and caffeine can change your sleep patterns, and they may make symptoms of some sleep disorders worse.While you sleep, a technologist monitors your to check for any breath problem you have during sleep and also monitoring the following activity : Brain wave Eye movements Heart rate Breathing pattern Blood oxygen level Body position Chest and abdominal movement Limb movement Snoring and other noise you may make as you sleep Conclusion : Sleep apnea is a common disturbance with many effects on sleep and daytime functioning. Obstructive sleep apnea is linked to many important adverse daytime consequences such as poor performance, accidents, hypertension, heart disease, stroke, and insulin resistance. By sleep study we can determine the type of breath disorder and which is the best treatment compatible.