Question

Why do we yawn when we are sleepy and drowsy ? ( Please give short answer)

Answer 1

Answer:

we yawn beacuse we feel that time our selves to be bored.

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Answer 2

Answer:

When we are sleepy or feel drowsy, we yawn because our brain cells lack sufficient amount of oxygen. Yawning helps us to draw in more oxygen and supply the much needed oxygen to the tired body organs including the brain.