Humans’ first experience with yawning happens in utero, says Matthew D. Epstein, M.D., associate medical director of the Atlantic Health Sleep Centers in New Jersey. Yet, Earth-side, the ...

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 ...

Ever notice how you automatically yawn when someone else does it? That involuntary mouth-stretching moment isn’t just your brain being lazy. It’s actually broadcasting something pretty revealing about ...

Johanna Simkin does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...