Why do we yawn ?

 Scientists believe that we yawn because we just don't breathe as deeply as we usually do. As this theory goes, our bodies take in less oxygen because our breathing has slowed. Therefore, yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood. 

Another hypothesis suggests that, It controls the brain temperature. Our brains work best at a certain temperature. Yawning somehow stops the brain from over-heating.

It also regulates blood flow and stretches muscles in the face that are all essential in cooling the brain.

 Why is the Brain hot? Scientists say it is due to exhaustion and sleep deprivation, Which is why we are more likely to yawn at these situations.

Is Yawning contagious? Do you yawn after seeing someone else do it? Yawning is a sign of empathy. Catching yawns may be an unconscious sign that you're attuned to other people's emotions, You are most likely to yawn after seeing someone socially or genetically related to you.

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