Why Do You Yawn? (It’s Not What You Think…)

By Dr. Mercola

Yawning is usually associated with boredom or being tired, but new research suggests there’s far more to this behavior than meets the eye.

The first clue that yawning serves a much greater purpose?

We do it involuntarily, like breathing, and it starts even before we’re born (as early as 11 weeks after conception).

There are a number of theories out there for why we yawn, but one of the most compelling is being explored by a Princeton University researcher and his colleagues, whose studies suggest yawning performs the important function of cooling your brain. >

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