Caffeine at night does more than keep you up late

September 17, 2015 1:53 PM

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(NEWSER) – It's no news flash that consuming caffeine close to bedtime can interfere with sleep. But scientists at the University of Colorado at Boulder report in the journal Science Translational Medicine that caffeine has another physiological impact on sleep by delaying the body's natural surge in the production of the sleep hormone melatonin, which in turn pushes back the body's circadian clock. "To our surprise, no one had really tested this question," one of the researchers tells NPR. "What we're seeing here now is another way that caffeine impacts our physiology that we didn't know about before in humans."

The problem in this case is that the circadian clock is "present in cells throughout our entire body," says the researcher. "It's in your fat cells; it's in your muscle cells." Messing with it appears to play a role in a wide range of health problems, from obesity to cancer. Many studies have recent...

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