Chang-Ho Yun received the M.D., M.MSc. and Ph.D. degrees from Seoul National University, in 1994, 1999, and 2003, respectively. He is a Board-Certified Neurologist and a Sleep Specialist, and the Former Research Fellow with the Division of Sleep Medicine, Harvard Medical School, and the Beth Israel Deaconess Medical Center, MA, USA, in 2008 and 2009. He was an Assistant Professor and an Associate Professor of neurology with the College of Medicine, Inha University, from 2003 to 2008. He is currently a Professor of neurology with the Clinical Neuroscience Center, Seoul National University Bundang Hospital, Seongnam, South Korea. His research interests include sleep respiratory and neuro-physiology to elucidate the role of sleep in brain health and cognitive impairment.