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6 Rather Surprising Causes of Yawns

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Sure, a yawn is a very natural reaction to a night of restless sleep, a boring work meeting, a traffic jam after a particularly long day at the office, or a response to another person’s yawn. However, science tells us that our involuntary yawns can also this…

1. Why We Yawn

Researchers have long pondered the yawn and the exact cause. Many assume yawning occurs from lack of oxygen or from being bored or sleepy. However, scientists have always suspected that yawning has more to do with than just emotions alone (i.e., boredom).

For instance, this National Institutes of Health study found that lack of oxygen induced by heavy breathing rate had no effect on yawning, but rather that yawns are governed by both body and the brain.

yawn

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