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 ...

Suddenly, you yawn too, almost like a reflex. But why? Is yawning just your body’s way of saying you’re tired, or is there more going on? In this article, we’ll explore the science behind ...

Seeing or hearing someone yawn can make you yawn. This phenomenon is not limited to humans; some animals experience contagious yawning, too. But why is yawning contagious? Brain cells called ...

Humans have yawns lasting around six seconds, while mice yawn for one or two seconds. Birds with large brains, such as owls, yawn longer than smaller birds, such as sparrows. Yawning may have ...

While too much yawning through the day may simply mean that you are tired, drowsy, or fatigued, it can also be a sign of an underlying, serious medical condition like sleep apnea, narcolepsy, or a ...

Tiredness, sleep deprivation, or certain medications usually cause yawning. If you find yourself yawning much more than usual on a daily basis, there could be more than tiredness or boredom going on.

Humans aren't alone when it comes to yawning — all vertebrates do it too, including fish, amphibians, reptiles, birds and mammals. But why? The "evolutionarily ancient" act of yawning likely ...

Yawning may serve an important physiological purpose, researchers believe. But because there can be a social stigma around yawning, some people may try to stifle it.

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 ...

A yawn is an involuntary reflex that involves opening the mouth wide and taking in a deep breath, followed by a slow exhale. Several theories exist about why we yawn, but researchers have not ...

Summary: Yawning is a universal behavior observed in many species, but why do we tend to yawn when someone else does? While the idea that yawning increases brain oxygenation remains unproven, some ...