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Biological Rhythms & Sleep
Humans, in general, get up in the morning and go to bed at night. We tend to stick to this pattern
even when we have the opportunity to change our behaviour, for instance, on holiday. We also see
difficulties in sleeping if we break our usual…

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bright light or regular social cues (for example; phone calls at the same time each day). This
research suggests an endogenous clock, but also recognises the important of exogenous factors.


Both internal and external factors appear to be involved in the control of circadian rhythms. The…

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rhythm. The SCN is therefore considered an endogenous pacemaker. There are also likely to be
other internal factors, such as fluctuations in temperature (Thompson, 2000)


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