why we do yawn when we feel sleepy
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Originally Answered: Why do we yawn when we feel bored or sleepy? When you feel sleepy..it is actually the brain cells which arein a sense of saying..going to fall asleep for lack of oxygen (hypoxia or hypoxemia). Also when we feel drowsy, our respiratory rate being controlled by reflex centres in our brain falls.
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we yawn when we feel sleepy because our system works slowly...and there is shortage of oxygen. so as to take in oxygen we yawn.
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