No one is entirely sure why we yawn — it’s one of the questions that still remains a mystery. But that hasn’t stopped scientists from having a few different theories regarding the human urge to yawn.

Yawning, an act so simple yet intriguing, holds a peculiar secret—it's contagious not just between humans but between humans and dogs as well. In our book, The Purest Bond: Understanding the ...

Yawning reverses cerebrospinal fluid flow, boosts brain blood surge, and may aid cooling and waste movement, challenging the idea that it signals boredom alone.

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 ...

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

Is it true that human yawns are contagious to dogs? Some dog owners swear that when they yawn, their dog does, too. And they may be right. Contagious yawning is a well-known phenomenon among humans — ...

Yawning seems like such a simple act, yet it holds surprising power over us. Just watching someone yawn — even a stranger — can suddenly trigger the irresistible urge to yawn yourself. Why does this ...

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 ...

Yawning can impact the flow of cerebrospinal fluid and venous blood flow, suggesting a regulation of neurofluids and increase in carotid arterial blood flow.

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 ...

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 ...