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WHY DO WE YARN WHEN WE FEEL SLEEPY?
 We yawn because we need extra oxygen. Our body senses we're running low on oxygen, and forces us to take an extra big gulp of air. Yawning is healthy for our lungs. Perhaps, every now and then, we get pockets and wrinkles in our lungs. A deep breath and a good stretch will smooth these wrinkles out.


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