Question

Why do we yawn when we are sleepy

Answer 1

because our body tired work whole day so it need more oxygen to work so our body take yawn to get sufficient oxygen
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Answer 2

HOLA META,

ITS TRUE ANSWER OF OTHER ONE..

BUT SCIENTISTS INVENT THAT IT OCCUR DUE TO LACK OF OXYGEN IN OUR BODY.

I HOPE IT WILL HELPFUL..

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