If you snore loudly and you wake up feeling tired even after a full night's sleep, you may have sleep apnea, is a potentially serious disorder in which breathing repeatedly stops and starts. On this week’s Please Explain two sleep specialists talk about what sleep apnea is and what problems and complications it may cause. We’re joined by Dr. David M. Rapoport, Professor and Medical Director of NYU Sleep Disorders Center; and Dr. Susan Redline is Professor of Sleep Medicine at Harvard Medical School, Senior Physician, Division of Sleep Medicine, Brigham and Women's Hospital, and Physician, Division of Pulmonary Medicine, Beth Israel Deaconess Medical Center.