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Keeping the circadian rhythm in balance is essential to our physiological well-being. It regulates the sleep-wake cycle, therefore, it has influence on hormone secretion.
Two hormones determine the human biological clock. Melatonin is responsible for our
sleep, while Cortisol enables the active hours. It is proven that light exposure drives the Cortisol level up in the morning, suppressing Melatonin levels during the day.