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Why we yawn has puzzled
scientists throughout the ages

Yawn theorists split into two camps. One side says yawning must have a physiological cause, and a physical benefit. The other side says yawning is a form of communication that offers various social benefits. Here are some of the theories:

Yawning cools the brain, according to a series of experiments by Andrew C. Gallup, PhD, a postdoctoral research associate at Princeton University.

Yawning communicates sleepiness and boredom, and people with high social competence and empathy are the most susceptible to contagious yawning, says University of Geneva physician Adrian G. Guggisberg, MD.

Yawning is connected to conditions and emotions, including stress, boredom, lack of stimulation, and being overworked, according to Michael J. Breus, PhD The Sleep Doctor, in his Sleep Well blog on WebMD.

Yawning is a signal that you are about to experience a migraine headache, according to Healthwise, Incorporated, on WebMD.

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