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A 31-year-old member asked:

Is there any scientific reason why yawning is contagious?

1 doctor answer2 doctors weighed in
Dr. Christopher Wilson
Sleep Medicine 21 years experience
Not that we know of: Yawning tends to occur with a change in level of awareness or level of arousal of consciousness. Why it's so contagious in unknown.

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Last updated Oct 4, 2016
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