Humans aren't alone when it comes to yawning — all vertebrates do it. But why? An expert explains the likely reason behind this "evolutionarily ancient" act.

You know the feeling. It’s getting close to bedtime, you get sleepy, and you start yawning automatically. You may even find yourself yawning in the middle of the day in a mid-day lull. These ...

Yawning robot made chimps want to get ready for bed The researchers began the experiment by creating a life-sized silicon human head equipped with a motorized, movable mouth.

Contagious yawning is a well-known phenomenon among humans, and research has shown that our canine companions can experience it, too.

Sleepiness is often written off as a byproduct of today’s always-on society, but it can have serious health consequences, experts say.

“Louis stealing the show with his yawning I love that kid!” one royal fan tweeted, referring to Louis yawning throughout King Charles’ coronation.

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 ...

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 begin to tighten, our nostrils might flare, and our eyes might tear up ...

Does yawning mean our brains aren’t getting enough oxygen? Researchers believe yawning may serve an important physiological purpose. There is no consensus, however, on what that is.