Yawns are weird. You’re tired? Why don’t you open your mouth really big about it? What’s that? You’re not tired, but you saw someone else open their mouth big? Well, guess what.
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[–] 9 points 11 months ago

This. I have started to wonder if yawns are actually a way to wake up. We know little about them. Some brain scans showed that we refresh the blood around our brain, like changing the water in a fish bowl.

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