Biological clock is the bodies internal regulatory system. Part of that system is the [circadian rythym](https://www.google.com/search?q=circadian+rhythm&source=hp&ei=qfmYYqesM7afkPIPt5i7iAo&oq=circa&gs_lcp=ChFtb2JpbGUtZ3dzLXdpei1ocBABGAAyCAgAEIAEELEDMg4ILhCABBCxAxDHARCvATIICAAQgAQQsQMyCAgAEIAEELEDMg4ILhCABBCxAxDHARCvATIICAAQgAQQsQMyEQguEIAEELEDEIMBEMcBEK8BMg4ILhCABBCxAxDHARCvAToOCAAQjwEQ6gIQjAMQ5QI6EQguEIAEELEDEIMBEMcBEKMCOhEILhCABBCxAxCDARDHARDRAzoFCAAQgAQ6CwgAEIAEELEDEIMBOg4ILhCABBCxAxDHARCjAjoLCC4QgAQQxwEQowI6CwguEIAEEMcBEK8BOggILhCxAxCDAToICAAQgAQQyQM6BQgAEJIDULcTWPMgYJ4waABwAHgAgAGDAogB5QiSAQUwLjUuMZgBAKABAbABDw&sclient=mobile-gws-wiz-hp#crs=q:circadian%20rhythm%20book,stick:H4sIAAAAAAAAAONgfcSYxC3w8sc9YanISWtOXmMM5uL0zCtJLSpOTS4REuFi9y9ILUrMSxHiFGLnYnXKz88uFjJAiKoKKXNxBqXmJJakpoTkC4lxsbnmlWSWVArxSHFxcejn6huk5RYZ8ixiFU3OLEpOTMlMzFMoyqgsychVSAKaBQCkAayKfwAAAA,cid:overview)
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