“During the daytime, the light that reaches us is relatively white or yellow and has a strong effect on the body clock and around twilight, once the Sun sets, the bluer the light becomes,” he said. “So if you want to avoid light having a strong effect on your body clock, dim and blue would be the way to go …

Artificial light permanently changed the way we live, in many ways for the better. But there has been a second change since the invention of artificial light that might be more consequential: the proliferation of electronic devices that create “blue light.” To that end, 96 percent of Americans now own cellphones, mostly smartphones, and 75% own desktop or laptop computers. About 50% own tablets and e-readers.2



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