"My grandfather's a little forgetful, but he likes to give me advice. One day, he took me aside and left me there."--Ron Richards
 

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Circadian rhythm
Circadian rhythm refers to an internal biological clock that runs approximately on a 24 hour cycle. It is an innate, daily, fluctuation of behavioral and physiological functions, including sleep waking, generally tied to the 24 hour day-night cycle but sometimes to a different (e.g., 23 or 25 hour) periodicity when light/dark and other time cues are removed.
 
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