Blue light itself isn't a bad thing. It's everywhere, including in sunlight. Researchers have determined that blue wavelengths — at the high end of the light spectrum, right before UV — are beneficial during daylight hours because they boost attention, reaction times, and .
Until fairly recently, humans were mostly exposed to natural light during the day and darkness at night. But now we're constantly bathing in artificial light, most of it blue. Too much exposure to blue light at night suppresses the secretion of melatonin, a hormone that regulates sleep cycles.
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