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The reader might wonder why a neurologist is editing a two-volume set of books on obstructive sleep apnea, since it is a sleep-related breathing disorder and would therefore appear to be within the domain of pulmonary physicians. However, besides pulmonologists-neurologists, psychiatrists, internists, pediatricians, and otolaryngologists have entered the field of sleep medicine. Many clinicians now treat patients with sleep disorders on a full-time basis. Sleep medicine has truly become multidisciplinary, and a sleep clinician is expected to diagnose and treat a wide range of sleep disorders, from insomnia to restless legs syndrome, that were previously referred by internists to other specialists.