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=== Patterns and rhythms of release === ...nal|author=de Weerth C, Zijl R, Buitelaar J |title=Development of cortisol circadian rhythm in infancy |journal=Early Hum Dev |volume=73 |issue=1-2 |pages=39–

..., Derk-Jan |date=1 October 1999|title= Circadian temperature and melatonin rhythms, sleep, and neurobehavioral function in humans living on a 20-h day |journ |accessdate=2007-11-25 |quote=... significant homeostatic and circadian modulation of sleep structure, with the highest sleep efficiency occurring

...[[melatonin]], [[Entrainment (chronobiology)|entrainment]] of the body's [[circadian rhythm]]s and regulation of the size of the pupil.