Humans’ first experience with yawning happens in utero, says Matthew D. Epstein, M.D., associate medical director of the Atlantic Health Sleep Centers in New Jersey. Yet, Earth-side, the ...

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 that could ...

Why do we yawn? Most vertebrates, including humans, yawn or exhibit similar behaviors. Spotted hyenas, which live in groups, ...

A new list says "excessive yawning," "whistling" and "too much laughter" could get you into trouble with airport security agents. Those gestures, along with "disguises," "face pale from recent shaving ...

A young man’s jaw locked mid-yawn at a railway station in Palakkad in Kerala, leaving him unable to close his mouth. A ...

If you’re a morning exerciser who’s no stranger to being up before the sun, yawning before or early into a workout isn’t strange. But is it normal to yawn while exercising if you’ve had a full night’s ...

Sign up for CNN’s Sleep, But Better newsletter series. Our seven-part guide has helpful hints to achieve better sleep. Find yourself yawning a lot? Do you need that ...