How does a person's biological clock work?
I believe there's a region or gland in the brain that regulates biological
clocks. This region or gland senses the environment's day/night cycle. I'm afraid I
don't know much more than that. Hope this helps.
No one knows for sure how any circadian (nearly 24 hour-in Latin) clock
works. Some interesting facts, though. The pineal gland in the brain is important.
Although shifting the day-night cycle can shift the clock, the clock runs on its own
without any dark-light cues. So it seems to be a natural chemical clock with a cycle
nearly, but not exactly at 24 hours, which is entrained by the 24 hour day-night cycle.
There are neurons in lower animals which can be kept alive alone, isolate from the
nervous system and from any light-dark cues, that show electrical activity on a
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Update: June 2012