Describe and critically asses the evidence that suggests the circadian rhythm is controlled by endogenous factors.

... Describe and critically asses the evidence that suggests the circadian rhythm is controlled by endogenous factors. The Circadian rhythm is a 24 hour cycle which occurs in humans in hormone levels, body temperature, heart, respiration and metabolic rate and sleep pattern. The circadian sleep-waking pattern is of most interest to psychologists because of the dramatic changes in behaviour it produces. The circadian sleep-wake pattern is said to be governed by many different factors, both endogenous and exogenous, which both have input into the circadian cycle in different ways. There are many endogenous pacemakers which can be said to have great effect on the 24 hour circadian sleep-wake pattern. The first is the biological clock, which is the interaction between proteins. Darlington et al., 1998, described one clock. They thought two proteins, Clock and Cycle linked together in the morning, due to this binding two other proteins increase their production during the day,

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