Sleep is an extremely important physiological function to maintain life. Based on the understanding of sleep and respiration in the basic theories of traditional Chinese medicine (TCM), this video mainly introduces the occurrence, special populations, pathogenesis, manifestations, adverse effects, identification in TCM, the treatment and health care methods of Obstructive Sleep Apnea Syndrome (OSAS), so as to enable students to know and understand the problems related to sleep and respiration, and to guide them to carry out the appropriate health care for the high-risk populations.