Causes of yawning:-

Even though causes of yawning are not exactly known, it’s believed following are main causes.

* a state of cooling mind.

* as a state of psychological decompression after high alertness.

* increased carbon dioxide in blood and decreased oxygen level.

* a mental state of poor emotions or apathy.

* excess mental strain

* to maintain middle ear pressure yawning is a body mechanism.

* higher alcoholic content in food or alcohol intake.

* lack of sleep, lack of rest to mind.

* biochemical substance variation such as serotonin, dopamine, etc in the brain.

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