Question

why do we yarn when we are felling sleeply

Answer 1

Hey friend nice question
When we are sleeping, we sleep after we eat. For digestion we need oxygen.
So body wants oxygen. Hence we yarn during sleep or when we feel sleepy.
Hope this helps you

Answer 2

Hey mate ^_^

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Answer:
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Yawning is human body's way of saying "Battery low. Only 20% remaining". Hence it will not depend on whether you are feeling sleepy or not. Although most of the time they both come together. 

#Be Brainly❤️