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Circadian rhythms can refer to any process that originates within an organism i. Circadian rhythms are regulated by a circadian clock whose primary function is to rhythmically co-ordinate biological processes so they occur at the correct time to maximize the fitness of an individual.
Circadian rhythms have been widely observed in animals , plants , fungi and cyanobacteria and there is evidence that they evolved independently in each of these kingdoms of life. The term circadian comes from the Latin circa , meaning "around", and dies , meaning "day". Processes with hour cycles are more generally called diurnal rhythms ; diurnal rhythms should not be called circadian rhythms unless they can be confirmed as endogenous, and not environmental.
In clinical settings, an abnormal circadian rhythm in humans is known as a circadian rhythm sleep disorder. The earliest recorded account of a circadian process is credited to Theophrastus , dating from the 4th century BC, probably provided to him by report of Androsthenes , a ship's captain serving under Alexander the Great.
The observation of a circadian or diurnal process in humans is mentioned in Chinese medical texts dated to around the 13th century, including the Noon and Midnight Manual and the Mnemonic Rhyme to Aid in the Selection of Acu-points According to the Diurnal Cycle, the Day of the Month and the Season of the Year. In , French scientist Jean-Jacques d'Ortous de Mairan conducted the first experiment designed to distinguish an endogenous clock from responses to daily stimuli.