Well I enjoy learning about the evolution of mankind and having learned something new I am going to share. I just finished reading an article about yawning at Discovery.com. Yawning is a cooling process. Your brain has an optimum temperature for operating and yawning cools your brain. What's more it is also used to change gears. Say you are waking up that shot of cool air down the back of your throat is enough to help your brain change gears to full wakefulness.
Now having said that, let me tell you. When you are overtired your cooling system is not working as efficiently and your brain starts to get hot. That is what causes you to yawn when you are tired. I know what I said comes from the article but in case you didn't click the link and read it... there you go now you learned something.
Have Fun and Be great
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