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There are three types of bodily rhythm suggested by psychologists; the Circadian rhythm, the Infradian rhythm and the Ultradian rhythm. A Circadian rhythm is a rhythm which repeats itself every 24 hours, whilst, the Infradian and Ultradian rhythms last longer and shorter than 24 hours (respectively). There are two factors that are capable of disrupting the bodily rhythms of humans. The first being Endogenous pacemakers, which are internal aspects that may upset the rhythms, and the second …

…to the Circadian rhythm is Seasonal Affective Order, which occurs in winter when people become depressed and tired. This is due to the shortened days and fewer hours of sunlight, which causes melatonin production to slow, and creates tiredness and depression. This kind of disruption of bodily rhythms, takes a toll on both the body and mind, and makes workers and students less productive. (People do not like to work in winter. Especially near Christmas!).