sleep cycle also known as the circadian rhythm is controlled by SCN cells , these cells use sensory 1 inputs from the optic nerves in our eyes to estimate the time of day and secrete melatonin based on the intensity of the light absorbed. High levels of melatonin correspond to sleepiness and are secreted throughout the evening and night. This biological process results in a pattern of systemic changes in the levels of melatonin throughout the day to trigger our sleep cycle. The circadian rhythm is a daily naturally occurring pattern embedded into our biological processes and indicates the presence of pattern seeking in innate biological processes. suprachiasmatic nucleus - cells in the hypothalamus which control the circadian rhythm. (Allot & Mindroff 2014) 1
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