Informational Speech: Yawns

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By the time this is over, you will have probably yawned, or at least have to fight the urge to. I don't plan to bore you in the slightest, but reading, thinking, seeing, or even hearing about yawns can kick in their famous contagiousness. On average, you'll yawn about 240,000 times in your life. Yawning is still a vast mystery, but various studies and expierments can partially explain why we might do it. There are an astonishing amount of reasons for the mysterious act, many of which have nothing to do with being tired at all. Yawning can be a sign of drowsiness, stress, aggression, or even excitement, which doesn't explain any patterns in the correlation of mood and yawns (Bakalar). Yawning functions in several different ways with our bodies. It stretches the jaw, diaphragm, and stretches the lungs to their capacity (Ost). Yawning also proves to be an energizer. People seem to have a burst of energy after a yawn, which could explain why our bodies natural tendency is to yawn when we are tired. Last, yawning brings the yawner a sense of pleasure. Do you ever feel good after a big yawn and strentch? Yawning is highly influences by the body's dopamine level. Anything that makes you feel glood releases dopamine in the body, and the higher level of dopamine, the higher the frequency of yawns. Dopamine is released during sleep, which explains the high frequency of yawns when you wake up (White). There's several other triggers to induce a yawn, or increase how often a yawn occur. Air pressure plays a significant role in one's yawn. When air pressure is higher, so is the amount of times you're likely to yawn. The yawn stretches out the ear drum, which makes the pressure equal between the inner ear and the outside. If you've ever been on a plane, or in higher elevation, you've probably yawned to "pop" your ears. This is what is occuring to cause the "pop"
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