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Why do we yawn

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Technically we yawn when our brains are too hot. So we yawn to cool our brains.

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WHAT?! your kiddin right?
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this is the best answer than any. if the brain had a lack of oxygen, wouldnt you hyperventilate? and if it was just because your tired, dont you think there is a little more to it then that?
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wrathseed
Really? I thought that we sweat when we get hot? Oh well I guess i'll just forget everything that I have learned
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no shes forreal!
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wrathseed
If we had TOO much oxygen we hyperventilate, and it is really a basic reflex that releases melatonine
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thats it, im doing a search on it
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I was pretty shocked when I learned that myself. :)
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wrathseed:dont forget what you have learned !
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so basically, theres a lot of theories on it, one of which is that the brain is overheating, another says its to draw in oxygen.
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wrathseed
What have I learned?
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Because we get tired, and when we are tired we yawn

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lack of oxygen

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mar30
I was gonna say that but u already said it. lol
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lol :) looks like you are too late!
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mar30
haha, im afard so. lol
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facebook me !?
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autumnrebelgirl@yahoo.com
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To let people know we're bored.

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haha i yawn and im never bored!
im a fun freaking teenager i have fun 24/7
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Well, it's good to know in case you need it in the future....or someone does it while to you. lol
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lol :D im sarcastic alot
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i think it's contagious. when some one near you yawns....kinda makes you wanna yawn too. :o

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when the brain is feeling tired, it begins to yawn to take in more oxygen to keep the brain awake until the body is ready to rest

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Lack of oxygen....

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To let oxygen get to the brain

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Because we are tired didn't get enough sleep that night and the lack of oxygen

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wrathseed

It is the brains way to help you sleep by releasing melatonin into the brain

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We yawn due to a lack of oxygen to the brain

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tiredness

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Lack of oxygen
I would open the window or exercise because our brain depends on oxygen to think

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hey therr !
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Actually scientists only speculate why we yawn...nobody actually knows the exact reason!!

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Lack of oxygen

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WERE tired!

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