Nightly News   |  December 08, 2011

Yawning more contagious among friends

Close friends and family are more likely than acquaintances or strangers to catch someone's yawns, a new study finds. NBC’s Brian Williams reports.

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This content comes from a Full-Text Transcript of the program.

BRIAN WILLIAMS, anchor: You know how contagious yawning can be? A new Italian study has found we catch it most from members of our own family and not because we find them boring. The research shows there's a longer yawn delay if you don't know the yawner. They say the reason might be empathy, how you feel toward your own kin, that causes the urge to yawn when a family member does it.