ANSWERS: 3
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I'm pretty sure it's because your body is trying to get extra oxygen in to keep you running.
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I don't yawn very much when I'm tired, only bored. But I have a kid that yawned from birth. Another one rubbed eyes, so I knew instantly what to do. +5
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The body trying to oxygenate the blood better to give us a boost in energy. 5/9/26
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