It also helps keep the body awake by stretching the face muscles, widening the jaw, and also stimulating blood circulation.

We’ve all been there– sitting in a meeting, reading a book, or daydreaming when someone nearby yawns. Suddenly, you yawn too, ...

Is it true that we yawn when our brains are deprived of oxygen? Most of us can feel a yawn coming on. The muscles in our jaw ...

Bournemouth University neuropsychologist Simon Thompson is an expert on yawning. In 2011, he posited that high levels of the stress hormone cortisol may be a direct cause of yawning. “We believe that ...

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 ...

meaning they have to remember to breathe, even while sleeping. As for why mammals yawn, scientists still aren’t sure why—it could be sleepiness, boredom, a need to oxygenate the brain or some ...