I noticed that on many occasions whenever one person yawns, another person almost always will too (obviously it depends on if they are tired or not). Like sometimes i have been sitting in class, and i notice someone yawn, then the person infront of them who doesnt even know whats going on yawns too. This just comes up a little too often, im wondering if there is some explanation for this.

Sorry if this is on the wrong board, seemed like it would fit the best here.