It keeps tabs on the light signals brought in through the eyes and discerns which type of light it is seeing. The SCN is located above the optic nerves that cross at the center of the brain. This master clock in the brain is called the suprachiasmatic nucleus (SCN), a tiny cerebral feature that is made up of a whopping twenty-thousand brain cells, and which is set to respond to light signals relayed via the protein melanopsin, which is located within the retina of the eye. All aspects of our DNA are woven into this internal timekeeper, which is synchronized through a paired group of neurons in the hypothalamus. These genes govern nearly every aspect of our lives, like inflammation, energy, sleep, memory, and healing, just to name a few. Almost every gene, hormone, and biochemical mechanism turns on and off at different times of the day. For the human body, the clock is divided into three segments wherein the activity is geared toward a specific theme: sleep, nutrition, and activity. So the concept refers to a cycle in which our body is meant to work “around the day.” This is an internal clock that is active for the entire twenty-four-hour period. The word “circadian” is generated from the roots circa (“around”) and dian (or diam, “day”). While the circadian rhythm is often overlooked or taken for granted by people going about their daily lives, there are vast ways it is vital to our overall health. And, it embodies one simple truth that many of us don’t realize: The timing of our bodily systems is often just as important-if not more so-as what we actually do with our bodies.
But, it does so much more it controls the entire functionality of our physical makeup. Further, to say that the body has a built-in timekeeper may give the impression that this mechanism merely regulates when we wake up, become hungry, and go back to sleep. When we refer to our bodies having some sort of internal timing mechanism, we’re closer to accuracy than even we realize, yet many don’t recognize the name of the most important internal clock that we have: circadian rhythm. is a prime example of one whose timing hasn’t yet been conditioned to life outside the womb. Many refer to the body as having some type of “clock.” When certain parts of the country change to Daylight Savings Time or when we cross time zones in our travels, for example, we complain that it throws off our “internal clock.” When we discuss life chapters such as those defined by childbearing or retirement, we refer to a “biological clock.” A newborn infant who cries for feeding at 3 a.m. To every thing there is a season, and a time to every purpose under heaven.
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