This issue of Sleep Medicine Clinics focuses on Sleep in Older Adults, with topics including: Sleep in Normal Aging; Insomnia in the Older Adult; Sleep Apnea in the Older Adult; Circadian Rhythm Sleep-Wake Disorders in the Older Adult; Restless Legs Syndrome; Periodic Limb Movement Disorder and Other Sleep Related Movement Disorders in the Older Adult; REM Sleep Behavior Disorder and Other Parasomnias in the Older Adult; Neurodegenerative Disorders and Sleep; Medical Conditions and Sleep in the Older Adult; Psychiatric Illness and Sleep in the Older Adult; Sleep and Cognition in the Older Adult; Sleep and Nocturia in the Older Adult; Sleep and Long Term Care; and Sleep in the Hospitalized Older Adult.