Researchers Shed New Light on Blue’s Effect on Sleep

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MANCHESTER, U.K.—Contrary to common belief, blue light may not be as disruptive to our sleep patterns as originally thought, according to University of Manchester scientists. According to the team, using dim, cooler, lights in the evening and bright warmer lights in the day may be more beneficial to our health. Twilight is both dimmer and bluer than daylight, they say, and the body clock uses both of those features to determine the appropriate times to be asleep and awake. Current technologies designed to limit our evening exposure to blue light, for example by changing the screen color on mobile devices, may therefore send us mixed messages, they argue. This is because the small changes in brightness they produce are accompanied by colors that more resemble day. Read More