The biological clock is a term applied to the brain process which causes us to have differance in body temperature and other bodliy activities. Its important function is to regulate the daily cycle of sleep. The major task of the biological clock is to provid an internal and very powerful wake-up single to the rest of the brain.
This signal is a mechanism that powerfully opposes the tendency to fall asleep. In the absence of any other stimulation, this process can usually keep us wide awake througout the entire day. This may not be true if we have accumlated a fairly large sleep debt. Normally, the biological clock is always synchronized with the daytime hours. However, if we travel rapidly to other time zones. it may occur during the sleeping hours, and we experience "jet lag."
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