A Glossary of Circadian Rhythm Terminology for the Researcher and Clinician

This glossary defines key terms used in basic and applied circadian science. The glossary is designed to enhance knowledge of basic concepts and assist with the translation of circadian principles to improve understanding of the pathophysiology and treatment of circadian sleep disorders. Definitions should be useful as a resource for researchers and clinicians with an interest in circadian research and circadian and sleep medicine. This glossary complements articles included in this issue devoted to circadian rhythm sleep disorders.