Reprinted with permission from SFARI.org, an editorially independent division of the Simons Foundation. (Find original story here.) Boredom, tiredness, hunger and stress can all set off a yawn. People ...

The phenomenon of contagious yawning has been analyzed by researchers for many years. Though many believe yawning increases oxygen supply to the brain, researchers publishing in Physiology & Behavior ...

The most scientifically backed theory about why we yawn is brain temperature regulation. Inhaling air can help cool brain temperature down. Even thinking about yawning can cause you to do it. It’s ...

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 ...

If your head is overheated, there's a good chance you'll yawn soon, according to a new study that found the primary purpose of yawning is to control brain temperature. Subscribe to read this story ...