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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 cycle of sleep and waking is regulated by the body clock. Body clock is located in the brain (suprachiasmatic nucleus). The clock has a period of about 24 hours. During a single 24 hour day we have a period of 6-10 hours when we are very sleepy. This is the time when we normally sleep. During the remaining 14-18 hours we are usually awake; however, only a portion of that waking time is suitable for intellectual effort.