Seeing or hearing someone yawn can make you yawn. This phenomenon is not limited to humans; some animals experience contagious yawning, too. But why is yawning contagious? Brain cells called mirror ...

Rather than catching a yawn on sight, muscles squeezing the uterus could be the trigger for a fetus to catch a yawn from its mother.

A mother's yawn may set off her unborn baby, too. (Westend61/Getty Images) Yawning is contagious. You've probably got one ...

Yawning seems like such a simple act, yet it holds surprising power over us. Just watching someone yawn — even a stranger — can suddenly trigger the irresistible urge to yawn yourself. Why does this ...

Dear Doctors: I have always liked how yawning feels and wondered what it’s for. I just read there is new information about how yawning affects your brain. Do you know anything about that? Also, do we ...

It's hard not to take other people's yawns personally, especially when you're in the middle of telling them a story. Longstanding beliefs, and evidence, suggests that drowsiness, which often follows ...

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Contagious yawning refers to the tendency of individuals to yawn after seeing, hearing, or even thinking about someone else yawning. About 40% to 60% of people exhibit contagious yawning when exposed ...