A well done video on Yawning, also about how it relates to empathy.
Contagious Yawning: Why We Do It, What It Shows About Us (VIDEO)
One’s tendency to catch other people’s yawns may depend on empathy. Children with autism spectrum disorders—who tend to exhibit impaired empathy— also show less susceptibility to catching yawns.
The video is full of interesting facts about yawning, including why other animals use it to look intimidating, attract mates, or just realign their jaws after a big meal.