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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.
This is not how the term is used within the context of sleep medicine, however. Instead, the biological clock refers to the body's ability to time innate processes to the external environment, most notably the timing of light and darkness, temperature, and resource accessibility.