why we yawn when we are sleepy or drowsy
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We yawn because the brain is working for whole day and consume more amount of oxygen due to which concentration of oxygen in brain reduce and we take a yawn .....
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Our body gets tired and it tends to take rest or sleep. When we feel sleepy rate of respiration slows down. Because of this lungs will not get enough oxygen and we yawn. Yawning bring extra oxygen to the lungs and helps us in being awake.
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