CNN Health: You Don’t Yawn Because You Are Tired

Every time we see someone yawn or even think about yawning, we just can’t help but yawn too. In fact, I am yawning as I am typing this sentence! I always thought that we yawned solely because others were yawning–a mimicking reaction. However, an article featured in CNN Health, reports that scientists at the University of Vienna found that the only strong predictor of yawning was…Temperature of the Brain!! Studies showed that people are more likely to yawn when the temperature of the brain is too hot. When one’s brain temperature is too hot, studies show that yawning helps to immediately decrease brain temperature. Other factors, such as age, humidity, and hours of sleep the night before, do not have signifiant effects on one’s likeliness to yawn.



More about the experiment:



3 thoughts on “CNN Health: You Don’t Yawn Because You Are Tired

  1. Grace, this is so cool! I have heard theories about why we yawn, especially why we yawn when other people yawn; however, I have never heard yawning related to the temperature of our brains. This is incredibly interesting and widely unknown. I will think about this whenever I yawn from now on!

  2. Whoa! Really?!?! I had no idea it had ANYTHING to do with brain temperature. I yawn a lot, so does that mean my brain is overheating? Hehe seriously cool article! Thanks for sharing!! Now I wonder…why do we yawn when we see someone else yawn? Coincidence?

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