Ask most people about their favorite drug of choice and you'll hear the same answer: coffee. It gets us up and at 'em every morning, and keeps our minds (relatively) sharp through that excruciating late-afternoon stretch. For many of us, it is the difference between functional and narcoleptic. In sum: We love our coffee.
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For years, scientists have known that blue light inhibits the secretion of melatonin, which calms our minds and dulls cognitive function. For this reason, experts recommend turning off the computer before bed, since the illumination from our LED-backlit devices prevents our brains from shutting down properly. But, according to a wide variety of studies, that same property