Why Yawning happen

Yawning is an involuntary action which we all do.

If we apply our general knowledge, then we all know it is a feature of sleeping.

It is commonly associated with tiredness, stress and boredom.

All baby animals like birds, cat, fish yawn. Human baby starts yawning since they are 20 years old.

During a yawn we open our mouth and we suck a large amount of air and expand our chest. The cavity pulls down our diaphragm and fills air in our lungs and exhales it out.

Yawning theories why animals and people yawn :

As per the physiological theory our bodies induce yawning in order to draw in more oxygen or remove a build-up of carbon dioxide.

A recent theory explains that we yawn more in the situations where our brain is likely to be warmer.

So, it's a way to cool down our brain.

Do you know the average yawn lasts around 6 seconds!

Yawning is contagious. Only human's, chimps and possibly dogs find them contagious. If we see someone yawning, we also feel yawn.

Recent study show contagious yawning may be linked to one's capacity for understanding and sharing the feelings of others.