RT Book, Section A1 Czeisler, Charles A. A1 Scammell, Thomas E. A1 Saper, Clifford B. A2 Hauser, Stephen L. A2 Josephson, S. Andrew SR Print(0) ID 1161369515 T1 SLEEP DISORDERS T2 Harrison's Neurology in Clinical Medicine, 4e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259835865 LK neurology.mhmedical.com/content.aspx?aid=1161369515 RD 2024/04/19 AB Disturbed sleep is among the most frequent health complaints that physicians encounter. More than one-half of adults in the United States experience at least intermittent sleep disturbance, and only 30% of adult Americans report consistently obtaining a sufficient amount of sleep. The Institute of Medicine has estimated that 50–70 million Americans suffer from a chronic disorder of sleep and wakefulness, which can adversely affect daytime functioning as well as physical and mental health. Over the last 20 years, the field of sleep medicine has emerged as a distinct specialty in response to the impact of sleep disorders and sleep deficiency on overall health.