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Yes , when you yawn you take a slow and deep breath that brings more oxygen to the brain. the oxygen gives your brain cells a little wake up call.
http://wiki.answers.com/Q/Does_yawning_mean_your_tired
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Uncategorized question: What does frequent yawning mean? Most likely because you're tired(duh) or really, really bored. Have you ever noticed yourself yawning at those times? It's usually because you start ... Most likely because you're tired(duh) or really, really bored. Have you ever noticed yourself yawning at those times?
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wiki.answers.com/Q/What_does_frequent_yawning_mean
wiki.answers.com/Q/What_does_frequent_yawning_mean
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Now, why people tend to yawn when they are tired, or how/why yawning seems to be contagious remains a mystery, but may be related to a stimulus modifiable reflex. Hope this answers it for you!
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www.madsci.org/posts/archives/aug97/867090165.Me.r.html
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These are MANY problems with this idea, but the main problem is that yawning occurs only when you are tired and does not occur in the many other instances of hypoxia. For example, ... This does not mean that humans don't use yawning to communicate feelings, but yawning certainly didn't originate for this reason.
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www.madsci.org/posts/archives/aug99/934846431.Gb.r.html
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THE TRUTH IS that we don’t completely understand why people, or animals for that matter, yawn. 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 evidenc...
http://uk.answers.yahoo.com/question/index?qid=20080911...
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Yawning...And Why Yawns Are Contagious ... According to this theory, when people are bored or tired, they breathe more slowly. As breathing slows down, less oxygen makes it to the lungs. As carbon dioxide builds up in the blood, a message to the brain results in signals back to the lungs saying, "Take a deep breath," and...
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faculty.washington.edu/chudler/yawning.html
faculty.washington.edu/chudler/yawning.html
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Yawning, excessive click here; Attacks Of Yawning: What Does It Mean? click here; Why Do I Yawn Even When I'm Not Tired? click here; Yawns, hiccups help fetal airway development click here...
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www.members.shaw.ca/hilaryking/Oldbrain1.htm
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There is a type of very rare brain tumor and a neurological illness that can cause excessive yawning, but it's very unlikely that you have anything like that. ... Lori: Even when I've had a good night's sleep and I'm not tired, I find myself yawning a lot in meetings and at church. Why is that?
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www.healthcentral.com/drdean/408/30826.html
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why does a person like myself yawn so much, i get spasms of yawning, especially after big meals and feel tired, sometimes my spasms of yawning mean i can yawn about twenty times consecutively! piccadilly (Tue 21:46 16/Nov/04)
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www.theanswerbank.co.uk/Body-and-Soul/Question78040.htm...
www.theanswerbank.co.uk/Body-and-Soul/Question78040.html
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