Please find below a list of disorders related to the diagnostic category, Sleep-Wake Disorders. This category contains diagnoses that were listed in DSM-IV under the chapter of Sleep Disorders. The Sleep-Wake Disorders Work Group has been responsible for addressing these disorders. Among the work group’s previous proposals is the recommendation of greater inclusion of disorders not listed in the mental disorder section of the International Classification of Diseases. This has been proposed primarily as a way to educate non-expert sleep clinicians (such as psychiatrists and general medical physicians) about Sleep-Wake Disorders that have mental as well as medical/neurological aspects (Reynolds et al., J Clin Sleep Med 2010; 6:1-2).  More recently, the work group proposed a reclassification of Hypersomnolence Disorders to include subtypes of Narcolepsy/Hypocrein Deficiency Syndrome; Narcolepsy Without Cataplexy/Hypocretin Deficiency Syndrome; Periodic Hypersomnolence, Kleine-Levin Subtype; Major Somnolence Disorder; and Hypersomnia Not Elsewhere Classified. Circadian Rhythm Sleep-Wake Disorders has also been renamed from Circadian Rhythm Sleep Disorders. Finally, the work has now updated their rationales for all of the proposed changes in this diagnostic category. We appreciate your review and comment on these disorders.