The exposure of human biological systems to light is ubiquitous. Importantly, light exposure from the sun determines much of human circadian rhythms and behavior. Sunlight at dawn promotes biological effects including waking, increases in glucocorticoid secretion, and feeding.7 In the modern-day era, however, exposure to light is not limited to sunlight exposure. Artificial indoor lighting and computers present in the workplace and home contribute a significant amount of light exposure.28, 33 Human exposure to light has also increased at night, whether from street lights, night lights, or workplace lights due to night shift work.
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