Why do we yawn ? 

When a person has a feeling of tiredness or hunger he/ she yawns to fight against it. It is a natural reflex of the human body. When we Yawn, actually what happens is our lungs take in a large amount of oxygen which in turn stimulates the brain and increases oxygen level in the blood- making us active. This makes our brain sharp and our body active. 

Some people cry when they yawn because their face muscles contract the tear glands and push out tear . Some people close your eyes when they yawn which block the tear glands and makes tear to come outside the eye. 

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