Discover how contagious yawning reveals your true emotional connections and why you mirror some people's yawns but not others ...

Most of us can feel a yawn coming on. The muscles in our jaw begin to tighten, our nostrils might flare, and our eyes might tear up as our mouths stretch open and we inhale a gust of air.

Yawning is an innate and reflexive behavior characterized by an ajar mouth accompanied by a deep inhalation and stretching of muscles around the throat, explains Epstein. That’s followed by a a ...

During a yawn, the eardrums stretch, and the eyes may close tight, causing them to water. It is generally an automatic reflex for most people. Yawning is usually considered a sign of tiredness and ...