Light from laptops, TVs, electronics, and energy-efficient lightbulbs may harm health, from the Harvard Health Letter
Studies have linked working the night shift and getting exposed to light at night to several types of cancer (including breast and prostate cancer), diabetes, heart disease, and obesity. It's not exactly clear why nighttime light exposure seems to be problematic. It could be because exposure to light at night curbs the secretion of melatonin, a hormone that influences circadian rhythms.
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