Yawning is an involuntary action that everyone does. We start yawning before we are born. Most animals (and creatures) yawn, chimpanzees and even snakes. The average yawn lasts about six seconds.
Yawning is the body's way of telling you that it needs more oxygen; a yawn opens up the respiratory system, then there is a sudden increase in oxygen, the accumulated carbon dioxide is eliminated, restoring normal breathing and alertness. New research suggests that rather than being a precursor to sleep, the purpose of yawning is to cool the brain so it operates more efficiently and keeps you awake. Scientists also speculate that we yawn due to to fatigue or boredom. (u think)
Yawning is the body's way of telling you that it needs more oxygen; a yawn opens up the respiratory system, then there is a sudden increase in oxygen, the accumulated carbon dioxide is eliminated, restoring normal breathing and alertness. New research suggests that rather than being a precursor to sleep, the purpose of yawning is to cool the brain so it operates more efficiently and keeps you awake. Scientists also speculate that we yawn due to to fatigue or boredom. (u think)
Why is yawning contagious? Researchers suggest that we yawn when we see another person yawn because we are hard-wired to do so; we are participating in an ancient ritual to help the group stay alert and detect danger. It's also been suggested that contagious yawning could be a result of an unconscious herding behaviour, a subtle way to communicate to those around us: similar to when flocks of birds take flight at the same time. Yawn contagion is unconscious.
You might yawn just reading about yawning :-
side bar: if you start to yawn while talking, take a minute to finish the yawn because it is hard to understand what you are saying; also, cover your mouth.
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