I usually wake up just ahead of my alarm. What's up with that?

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

Call it "precision waking" — the alleged ability to decide when you want to wake up and then doing so, without an alarm. If you think you can do it, you're not alone, though how is still mysterious.

(Image credit: Sarah Mosquera/NPR)



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