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A member asked:
Why do people yawn when there not tired or sleepy and feel like not getting enough oxygen?
A doctor has provided 1 answer
Yawning: Scientists speculate that the onset of a yawn is triggered either by fatigue, or by sheer boredom as, at those times, breathing is shallow, and little oxygen is carried to the lungs by the oxygen-toting cardiovascular system. When one yawns, his or her alertness is heightened, as the sudden intake of oxygen increases the heart rate, rids the lungs and the bloodstream of the carbon dioxide buildup, .
Answered 3/27/2013
5.2k views
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People also searched for:
So i woke up this morning for work didnt want to wake up i was sleeping so good. Today i iust keep yawning and i feel sleepy. Is my brain need oxygen or could i just be tired or skmething worse? Just seen fam doc said lungs and heart sounded good
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