Why Do We Yawn? — The Science Behind It.

By Unknown - August 09, 2017

Yawning Facts

Yawning still baffles many today. You don't see it coming, and you can't control it. Trying to do so will only make you look awful. Is yawning still a mystery? Lets talk a little about it.

A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by a slow exhalation of breath. The eyes may also close tight, which may cause them to water.

You cannot cause it to happen, nor does it have different signs in each person. Yawning is associated with tiredness, sleepiness, boredom and hunger also. It occurs in most people before and after sleep.

Some reasons proposed by scholars about the causes of yawning include;

One study states that yawning takes place when one's blood contains abnormally high amounts of carbon dioxide and wants it to be dismissed and replaced with a stream of oxygen. Only a  yawn can provide that.

Nervousness has also been counted as a reason for yawning. It is that sensation your body feels when there is a need to take quick action.

Although there are more than 20 theories associated with yawning, there's not a single one that all experts agree with.

Do you know?

•The medical term for yawning is oscitation.

•It is discovered that babies yawn even in the womb.

•Most animals yawn, which includes dogs and chimpanzees.

•The average yawn last for just eight seconds.

•An average healthy person yawns up to ten times in a hour. That's an approximate figure of 240,000 times in a lifetime.

Yawning cools the brain by increasing the amount of oxygen supply to the brain. The taking in lots of air and fast heartbeat also makes blood and spinal fluid flow faster and may also cool the brain.

Yawning can be contagious. “One man's yawning makes another yawn, ” as said by Erasmus in 1508.  Looking at someone's face when he or she is yawning, thinking or reading about yawning can  cause you to yawn also.

However studies have shown that children with autism spectrum disorder do not display contagious yawning.

Take note though; excessive yawning may be a sign of a disease. It could be could be reaction caused by your vagus nerve, which might indicate a heart disease says the National Institute Of Health. If your are experiencing excessive yawning and are concerned against it, please consult your doctor or any medical professional.

  • Share:

You Might Also Like