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Why do we yawn, when we're tired?
I thought since when we sleep, our airways expand a lot, so maybe it’s ready to expand?
Or doesn’t it stretch your throat (in a good way)?
I dont know lmfao :P
I read in some scientific journal that in the waking and exhaustion cases, it’s the result of a small lacking of oxygen to the heart, and your body trying to compensate.
Cause when you yawn it gets more oxygen to your brain, so you can wake up a little :]
my boyfriend told me that!
:]
Yawning is interpreted to have a variety of meanings, ranging from tiredness to boredom. Perhaps more interesting is the fact that yawning is contagious among humans, at least: watching someone else yawn, seeing a photograph or reading about – and even the mere thought of – yawning is enough to induce this behavior in observers. (Tell me: have you yawned yet?) Even though yawning is very common, the physiological and evolutionary reasons for yawning behavior are poorly understood: http://scienceblogs.com/grrlscientist/2008/12/yawning_and_thermoregulation_i.php
Take care !!
yawn lol I agree with the oxygen to the brain and all to increase energy.
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