Yawning Is a Wake Up Response

Yawning is actually a wake up response. You yawn, then you are feeling sleepy and you want to wake up. One of the reasons why yawning is contagious is because when you see somebody yawning, it means they have spotted something that is important enough to wake up from. And so you'll notice that every time you yawn, for a few seconds after that you're a little more awake than what you were right before.

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