A new study is giving you permission to literally yawn in everyone's face this morning. Trust me, you're not being rude. In fact, you're actually just showing off your intelligence (OK, I guess that's ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Compare all the biological quirks of the average human, and the act of yawning—also known as ...

I read that yawning is contagious. Oh, honestly. As soon as I heard it I yawned. You all know yawning is an involuntary opening of the mouth and taking a long, deep breath of air. This is most often ...

The average adult yawns about 20 times a day. But why? Surely we can’t all be that tired. The truth is, the science behind yawning is more complex than just a few hours too little sleep. Even more ...

TIME’s new health column, It’s Not Just You, explores the phenomena behind some of life’s most everyday yet baffling behaviors. If seeing someone mid-yawn makes you involuntarily stretch out your ...

There is something you do when you’re tired, aroused, bored, or even hungry, but nobody completely understands why. Get your mind out of the gutter, I’m talking about yawning. We do it every day, ...

Humans aren't alone when it comes to yawning — all vertebrates do it too, including fish, amphibians, reptiles, birds and mammals. But why? The "evolutionarily ancient" act of yawning likely serves a ...

Simon Thompson’s claim that yawning is associated with brain warming seems to be pure speculation (20/27 December 2014, p 38). When offered a hot towel during flying, I always applied it to my ...

Bears do it; bats do it. So do guinea pigs, dogs and humans. They all yawn. It's a common animal behavior, but one that is something of a mystery. There's still no consensus on the purpose of a yawn, ...

Yawning is an automatic body response to tiredness or stress. Less commonly, excessive yawning can also be a sign of an underlying health condition. It can be related to the vagus nerve, sleep ...