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yawning

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piccadilly | 21:46 Tue 16th Nov 2004 | Body & Soul
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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!
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i heard somewhere that yawning meant that you werent getting enough air to the brain. so a yawn made you take a deep breath, fill your lungs and hold it for longer. coz when u breath normally its usually shallower breaths.  ??? 
I only looked at the title of the question & it made me yawn my head off! (It's only 09:00)! 
The reason u are tired after eating is because your body uses all its resources to break down the food.
I too yawned 3 times whilst reading this! I have been at work for 9 hours and still have 3 to go, so I'm reaching for some caffeine
I read there are lots of theories about yawning and that it is one of those things that science cannot totally explain.  For example why newborn babies do it - usually these inborn reflexes havea survival link but no one has been able to explain what advantage this might incur.  And also why it is contagious! Also studies have found it is not always when you are tired or have low blood oxygen levels.  So think there is still research to be done!

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