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The science relating to temporal, primarily rhythmic, processes in biology.*
circadian rhythm circadian time circasemidian rhythm constant routine cycle dim-light melatonin onset diurnal DLMO entrainment free-running intrinsic circadian period light-dark cycle melatonin period photoperiod phase response curve PRC rhythm SCN suprachiasmatic nucleus synchronized tau zeitgeber
*Reprinted with permission from: Culebras, Antonio Clinical Handbook of Sleep Disorders Hardcover © 1996 Butterworth-Heinemann
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