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.

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

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.

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.

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 ...

Kai Trump, the 17-year-old granddaughter of President-elect Trump, posted a vlog of her election night experience on Monday, capturing intimate moments of the Trump family celebration.

WASHINGTON, June 27 (Reuters) - Top U.S. Republicans confronted a yawning budget hole in their sprawling tax-cut and spending bill on Friday, signaling that they could miss President Donald Trump ...

Brits share top awkward yawning moments - from funerals to job interviews A new study has revealed the most common situations in which Brits have been caught yawning.

More like “monkey see, monkey pee.” Yawning isn’t the only bodily function that’s contagious. Japanese scientists have discovered that chimpanzees are more likely to urinate when they see ...