Why people yawn when they are sleepy? Are there any biological reasons behind yawning?
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Yes! In an airplane, you may involuntarily yawn to equalize pressure within your ears. We also yawn when we see someone else yawn and this is called social empathy. Scientists speculate that we yawn not from sleepiness or boredom, but that it’s a reflex your brain induces to wake you up. There are some hormones that are released that briefly increase heart rate and alertness.
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