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Light from screens can make your brain think it’s time to wake up
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Updated September 26, 2022
“Because of its wavelength, blue light disrupts healthy sleep,” says Phillip Yuhas, an assistant professor at the Ohio State University College of Optometry. When you look at a bright screen, certain cells send a message to your brain’s clock, setting it for daytime-level alertness — and waking you up. This stops the body’s release of melatonin, the hormone that regulates your body’s internal clock.
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