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Caffeine At Night Resets Your Inner Clock

02:04

September 16, 2015

Nell Greenfieldboyce

Gulping down coffee to stay awake at night delays the body's natural surge of the sleep hormone melatonin. (Hayato D./Flickr)

Related:

Circadian Surprise: How Our Body Clocks Help Shape Our Waistlines
Why Lab Rats Don't Observe Daylight Saving Time

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