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WEKU
WEKU
Will Stone

RARE PHOTOS: I usually wake up just ahead of my alarm what s up with that | Vintage Vibes

Humans have an elegant and intricate system of internal processes that help our bodies keep time, with exposure to sunlight, caffeine and meal timing all playing a role. But that doesn't account for "precision waking." (Sarah Mosquera/NPR)

Maybe this happens to you sometimes, too:

You go to bed with some morning obligation on your mind, maybe a flight to catch or an important meeting. The next morning, you wake up on your own and discover you've beat your alarm clock by just a minute or two.

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