It happened this past week -- a yawning gap in our knowledge filled at last. Humans do it ... chimps do it ... even educated dogs do it. We all do it: We all tend to start yawning when we see, or even ...

Watch a group of lions yawn, and it may seem like nothing more than big, lazy cats acting sleepy, but new research suggests that these yawns may be subtly communicating some important social cues.

Researchers believe the yawning robot may have triggered some biological mechanism in the chimps that they associated with sleep. Image: Popular Science composite ...

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 ...

Yawning is an involuntary action characterised by opening your mouth wide, taking a deep breath, and then exhaling slowly. It ...

Confidential list of behaviors watched by TSA agents was recently leaked online. A TSA document lists exaggerated yawning as a suspicious traveler behavior. Getty Images — -- Excessive yawning, ...

Prince Louis stole the show … again. The young Prince, who recently turned 5, appeared slightly bored by the fuss being made over his grandfather on Saturday, repeatedly yawning, fidgeting in his seat ...

Lions find yawning contagious in a similar way to humans, a team of researchers has found. The phenomenon may be a way of helping the big cats to stay vigilant, scientists believe. The team, from the ...

Feeling tired? Even if we aren't tired, why do we yawn if someone else does? Experts have published research that suggests the human propensity for contagious yawning is triggered automatically by ...

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 ...