Circadian rhythm.
Illustration of the biological clock. Depending on sunlight perceived by the eye, signals are sent to the suprachiasmatic nucleus, home of the circadian clock, located in the hypothalamus, which controls various biological rhythms. The brain controls the secretion of melatonin (sleep hormone), which increases as light diminishes. (Photo by: Jacopin/BSIP/Universal Images Group via Getty Images)

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In stockPlease note: images depicting historical events may contain themes, or have descriptions, that do not reflect current understanding. They are provided in a historical context. .
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1141934086
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May 27, 2018
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941_04_bsip_015698_016.jpg
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