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THE SUPRACHIASMATIC NUCLEI AND THE PINEAL GLAND. Most human bodily functions and behaviours are not âsteady-stateâ. Instead, they fluctuate in 24-hour cycles, such as the sleeping and waking cycle and the cycles for body temperature, hunger, and the secretion of various hormones.
The complex process of the sleep-wake cycle is controlled by the bodyâs circadian rhythm and sleep homeostasis (the amount of accumulated sleep need that builds during time spent awake). Circadian rhythms are regulated by the bodyâs internal master clock which is located in the brain. This master clock controls many biological functions over a 24 hour period, such as the release of hormones, body temperature changes, and sleep-wake cycles.