Add Yahoo as a preferred source to see more of our stories on Google. So why exactly do we yawn? And why is it nearly impossible to stifle a yawn when someone does it in front of you? Let’s find out.

In a new study, yawning has been shown to push the brain’s clear fluid in the opposite direction of a deep breath.

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 ...

Yawning has long been dismissed as a sign of boredom or fatigue, a social cue we mostly try to suppress in meetings and on video calls. New brain imaging work suggests that instinct is misplaced. When ...

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

Open your mouth wide, stretch the muscles of your jaw and upper body, take a slow breath in, and then exhale quickly. What have you done? You have yawned. Many animals, including humans, yawn. They do ...

Is it true that we yawn when our brains are deprived of oxygen? Most of us can feel a yawn coming on. The muscles in our jaw begin to tighten, our nostrils might flare, and our eyes might tear up as ...

Most people seem to be quite sure they understand yawning. They think it is caused by the need for oxygen, or boredom, or sleepiness. A group of medical scientists (Walusinski 2010) have upset this ...

Among the occupations that get the shortest amount of shuteye each night, several make life-and-death decisions regularly. And members of one profession on the list carry guns on the job. Anybody need ...

You'd think it'd be easy to spot some of the signs that you aren't getting enough sleep, right? The yawning, the severe caffeine dependency, the falling asleep while standing up on the bus (is that ...

Many medical conditions may lead to a disruption of sleep, or an excessive amount of daytime sleepiness, and are called sleep disorders. Sleep disorders include snoring, sleep apnea, insomnia, sleep ...

I can answer this for everyone: no. Possibly heck no. The question, if you're curious, is whether you're getting enough sleep. Few people think they get enough, because however much you get, you know ...