Answer:
Contagious yawning, or the reflexive tendency to yawn following the detection of yawning in others, is well-documented among humans and a growing number of social vertebrates.
Step-by-step explanation:
Mirror neurons in the brain are thought to be the mechanism behind contagious yawning. These neurons match our actions to the people around us. So if you see other people yawn, chances are you're compelled to become a yawner, too, even if you aren't bored or tired