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The central circadian clock resides in the hypothalamus in the brain, he added. It keeps in touch with the outside world by means of light signals from the eyes, and then synchronises numerous other peripheral clocks in tissues around the body such as the heart, liver and gut. ... It now appears that virtually all cells in the body have their own ticking circadian clock, including skin cells.

2008-01-28

 brain circadian time internal clock sleep