Outlines the classification and diagnosis of sleep disorders, including various insomnias and circadian rhythm anomalies, restless legs syndrome (RLS), and periodic limb movement disorder (PLMD). Identifies other conditions that may contribute to sleep disorders, including neurological, endocrinological, and psychological disorders. Describes the approaches to management of sleep disorders, both pharmacological and nonpharmacological (e.g., dietary, hygienic, and psychosocial). Identifies clinical ramifications of sleep apnea and RLS/PLMD pertinent to dental practice and general clinical practice.