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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.
It's because youâand most other animalsâhave a kind of internal clock that controls the cycle of the day's biological activities, such as sleeping and waking. These daily biological activities are known as circadian rhythms because they are influenced by the regular intervals of light and dark in each 24-hour day.