The classification system most widely used to characterize sleep disorders is the International Classification of Sleep Disorders (ICSD), established by the American Academy of Sleep Medicine in association with the European Sleep Research Society, the Japanese Society of Sleep Research, and the Latin American Sleep Society. The third edition of the ICSD (ICSD-3) lists seven major subcategories of sleep disorders: (1) insomnia, (2) central disorders of hypersomnolence, (3) circadian rhythm sleep-wake disorders, (4) sleep-related breathing disorders, (5) sleep-related movement disorders, (6) parasomnias, and (7) other sleep disorders. The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), also contains information on these sleep-wake disorders and is appropriate for a general medical or mental health clinician, although the ICSD is used for a definitive diagnosis ...