The lack of oxygen, boredom, and fatigue have all been said to cause a person to yawn. Yawning is an involuntary action that we learned prior to birth. If you think about yawning or read about it, most likely you will yawn!
http://answers.ask.com/Health/Diseases/what_makes_you_y...
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The body makes a waste product called as carbon dioxide that is exhaled from the lungs when you breathe out. When you are sleepy, bored or tired, ... So, your brain makes you take an extra breath, which is deep and long called a yawn, so that you can take in more of oxygen and give out carbon dioxide fully.
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www.pediatriconcall.com/kidscorner/whywhat/Why_yawn.asp
www.pediatriconcall.com/kidscorner/whywhat/Why_yawn.asp
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it does not apply to most of the people.I yawn only when i feel bored & tired. The reason behind yawning while feeling hungry can be that ,due to lack of food in the body,the body lacks energy & compensates for ... Because when you're hungry, your energy levels are often down, which makes you tired, which makes you yawn.
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answers.yahoo.com/question/index?qid=20080710091826AABt...
answers.yahoo.com/question/index?qid=20080710091826AABtqve
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It’s widely assumed that yawning occurs because we are tired or bored or because we see someone else doing it, but there isn’t any hard evidence to support these beliefs. Scientists do not purport to know all of the biological mechanisms of...
http://wiki.answers.com/Q/What_makes_you_yawn
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However this theory is slightly marred by the fact that we don't yawn during exercise which is when our bodies need more oxygen. ... A.� It's an involuntary action, it makes us open our mouths and breathe in very deeply. It's something we do from very early on, even within the womb. And humans aren't the only yawners;
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www.theanswerbank.co.uk/Article2542.html
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Dear Aubie, What makes people yawn? ... You may also see Olympic athletes yawn before their event and they are not likely bored or drowsy. Also, scientists have created situations where oxygen levels are low and carbon dioxide levels are high in the lungs but those conditions did not make people yawn any more than...
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www.auburn.edu/communications_marketing/askaubie/091504...
www.auburn.edu/communications_marketing/askaubie/091504.html
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Yawning is a great example of a behaviour that we all engage in involuntarily. While its specific usefulness is unclear, it is common to us all. Its social implications are interesting. When one person starts to yawn, ... That makes us think that it is more tied to psychological and sociological factors than physiological ones.
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www.scienceshorts.com/020321mb.htm
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This article is part of Nature's premium content. ... Self-awareness makes some yawn-susceptible. ... Self-aware or empathetic people are more likely to catch the yawns, say US researchers1.
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www.nature.com/nsu/030728/030728-2.html
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Yawning makes dogs yawn too...If you yawn near your dog, chances are it will yawn too, British scientists say. ... If you yawn near your dog, chances are it will yawn too, British scientists say.
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www.metro.co.uk/news/article.html?in_article_id=250111&...
www.metro.co.uk/news/article.html?in_article_id=250111&in_page_id=34
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