Abstract
Any overt circadian rhythm in humans is the sum of endogenous and exogenous components. There is now overwhelming evidence that the endogenous component is driven by an autonomous clock; thus overt rhythmicity in a human will continue in the absence of external rhythmic factors or when these have been modified. The exogenous component results from a combination of the rhythmic environment and rhythmic habits of the individual (see 1,2,3,4 for reviews).
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Folkard, S., Minors, D.S., Waterhouse, J.M. (1985). The Desynchronisation of Rhythms and its Implications for Internal Clocks. In: Redfern, P.H., Campbell, I.C., Davies, J.A., Martin, K.F. (eds) Circadian Rhythms in the Central Nervous System. Satellite Symposia of the IUPHAR 9th International Congress of Pharmacology. Palgrave Macmillan, London. https://doi.org/10.1007/978-1-349-07837-0_11
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