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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 your own biological clock called your circadian rhythm. Coming from two Latin words: Circa, meaning 'approximately' and dies, meaning 'day,' this 'clock' regulates your sleeping pattern over the course of a 24-hour day. The circadian rhythm is mostly comprised of a group of cells called the suprachiasmatic nucleus (SCN), which is located in the hypothalamus.