circadian rhythm

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circadian rhythm:

see rhythm, biologicalrhythm, biological,
cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the environment.
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circadian rhythm

[sər′kād·ē·ən ′rith·əm]
A self-sustained cycle of physiological changes that occurs over an approximately 24-hour cycle, generally synchronized to light-dark cycles in an organism's environment.
References in periodicals archive ?
The human clock is controlled by our genes, and the research also suggests that some people may be more at risk of the effects of circadian desynchrony than others.
This beautiful symmetry between the human clock and the daily cycle of the Earth's rotation is disrupted by exposure to artificial light cycles, and by irregular meal, work and sleep times.
Electric light allowed humans to override an ancient synchronisation between the rhythm of the human clock and the environment, and over the last century, daily rhythms in meal, sleep and working times have gradually disappeared from our lives," Cathy Wyse, lead researchers from the University of Aberdeen, said.
The human clock is set by exposure to sunlight, but also by when we eat, sleep, and exercise.
Joshua 24 celebrates one of those pivotal moments in biblical history when a people step beyond the chronos of what is supposed to happen according to human clocks and calendars and into the kairos fullness of time when an extraordinary God-given possibility changes everything.
Research on animal and human clocks shows that they are fine tuned by natural and man-made time cues, for example the daily changes of light and temperature, alarm clocks and 'noise-pollution'.

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