FWIW, I don't think we really know why people yawn. Yeah, people yawn when they are sleepy, but how does that account for the fact that yawns are so contagious? To me it says that yawns have some sort of social meaning.

According to the experts dogs yawn when they are upset, confused or need a break. Thus, I think it is likely that it is a form of preverbal communication.

So I guess what I'm trying to say here is that maybe you need to give yourself a break here. Even if your therapist was tired, it doesn't mean that he was tired of you. You just happened to be there when an autonomic response happened. Even if he was trying to communicate something, it may not be what you think.

I wonder, if he had hit his knee and kicked his leg would you feel the same way?

peace