In real life when you see someone yawning, you’ll be induced to yawn yourself too. Its next to impossible to suppress a yawn. The meaning of dreaming of a yawn can take on that of this real life activity. That is, you will be sucked into doing an activity, even if you dislike it. Thus, the dream imagery of yawning means bad news or bad luck is coming. The dream symbol of yawning is generally linked to approaching threats, since the yawn induces you to yawn too. So the act of being forced to yawn means it is bad.