My wife has been off caffeine for the last couple weeks as a self-experiment. She is yawning a heck of a lot more. I am talking multiple times a minute. That means I am yawning a heck of a lot more as well.
But why is that? I am not more tired than usual and, unlike my wife who likes to live life on the edge, I am drinking my delicious coffee every morning. But as she yawns, my yawn frequency goes up. This may be because humans mimic one another, or maybe I am doing it in solidarity with her caffeine-free situation. Turns out that yawns are a lot more exciting than they appear to be.