When you are tired, sleepy, sitting in a stuffy room, or simply bored, you breath more slowly. When breathing slows down, your lungs aren't able to bring enough oxygen your body needs or get rid of carbon dioxide efficiently. As the level of carbon dioxide in the blood builds up. your brain is alerted and sends a signal to your lungs to take extra deep breath called yawn.
A yawn makes you breathe in oxygen very deeply, and breathe carbon dioxide fully. Hooooo humm.. grrr now im yawning :)
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