So why do we do it then? Well, new research suggests it might be because yawning cools the brain down and prevents it from overheating, much like the fan in your laptop. So, why do we yawn when tired?

Why Do People Yawn More When They Feel Tired A tired ... While it is a completely natural and ubiquitous behaviour, the ...

While researchers aren’t quite clear why yawning happens, we do know it can be triggered by a variety of factors, many of which have nothing to do with our energy levels. And in some cases ...

It’s almost impossible not to yawn after seeing someone else do it, but most of us probably ... on in our bodies and brains when we are yawning, and why is it so hard to stop?

Mammals and birds yawn, and just like humans, the bigger their brains the longer they yawn. Humans have yawns lasting around six seconds, while mice yawn for one or two seconds. B ...

Q: Do marine mammals, such as whales, dolphins and seals, yawn? And if so, why? — Robert Allen | Colfax, California Pretty much all vertebrates yawn, says Rachel Metz, a curator at the ...