Why people yawn when they are sleepy? Are there any biological reasons behind yawning?
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This is one of the more practical explanations I’ve heard:
Your breathing patterns change when you sleep to provide more oxygen to your brain. Sleep is kind of like recovery and repair mode for your brain, and the deeper sleep breathing feeds your brain with oxygen to help with the recovery and repair.
Yawning is your body’s reaction to your brain craving oxygen. A yawn is essentially a very deep breath, and helps your oxygen-hungry brain get enough oxygen to keep it going.
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