How well are you breathing when you are sleeping? People with obstructive sleep apnea have their airways blocked, causing them to take shallow breaths or even stop breathing. Sound sleep is impossible. Here to tell us more about diagnosing obstructive sleep apnea with a polysomnogram and how to treat it are Dr Lee Leong Meng, ENT consultant and Wan Mui Quan, medical lab technologist, from Sunway Medical Center.