ATLANTA — Find yourself yawning a lot? Do you need that third or fourth cup of coffee to make it through the afternoon at work? Such signs of sleepiness may be a red flag of a serious sleep deficit ...

Let's start at the beginning. Who yawns? Everybody. Not just people, but cats, dogs and fish do, too! What is a yawn? It is an involuntary action during which you open your mouth and breathe deeply ...

Many of the videos suggest social mirroring, which happens when individuals unintentionally imitate the actions of others, along with empathy, may be why some people yawn when they see others do it ...

Yawning is often seen as a simple sign of fatigue or boredom. However, this natural and universal reflex could reveal much more about your hormonal health—particularly your levels of cortisol, the ...