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health advisory Hospital Health advisory 2007-11-16 5:20:56

In theory, this means you shouldn't yawn if you hear someone yawn over the phone or on tv. But since those technologies weren't around yet when the reflex developed, your brain doesn't differentiate those yawns from yawns from someone in the same room.

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You yawn because your body needs extra oxygen so inhales extra. When you see someone yawn your brain is triggered and thinks that you too will need exttra oxygen so you yawn and take in the extra breath.

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I heard that its the body's way of getting more oxygen into the system, usually when the breathing slows down when you are tired. Therefore, when you suck in most of the oxygen inthe room it creates a shortage, meaning that people near you are also then needing more oxygen.

That kind of makes sense until you think that that would surely have no ending, meaning that eventually everybody would be yawning.

just imagine for 1 minute if you walked into town and every single person was yawning at the same time, freaky huh? ha ha ha

Would look like a horror movie.

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So why has just reading this question made me yawn??? Weird

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its highly contagious

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No one is entirely sure why. Some seem to think it's some form of communcation barried deep within human history. While others think it's do to our nature of being tired, and we need more oxygen to our brain.

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