Why exactly do people yawn? No one actually knows, although there are many theories. All we really know about yawning is that everyone does it, whether you’re one or one hundred years old. There are too many theories to go through at this moment, so I’ll cover my favorites.
One theory suggests that we yawn because we aren’t getting enough oxygen. According to this theory people don’t breathe as much when they’re bored or tired. Yawning supposedly increases the amount of oxygen you get. The issue here is that increasing the amount of oxygen has never actually been shown to decrease yawning.
The next theory is that yawning stretches the lungs. It’s supposed to make you feel more awake by increasing heart rate. Stretching is also connected to this because it stretches the joints, which also increases your heart rate.
No one is really sure about our reason for yawning, but we do know that they’re contagious in some way. When you see someone yawn, you can’t help but do the same. Even mentioning yawns can make you yawn. I hope this article hasn’t caused you too many.
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