My T sometimes yawns frequently. I think it may be what part of the day your session is. A non-morning person might yawn first thing in the morning, then there is the after lunch slump and again at the end of the day. Mine said he yawned mostly because I was the last appt of the day. I asked why he seemed to be getting mad at me more often over the last few months and he admitted he had less patience at that time and he suggested we move our appts to first thing in the day because he admitted he was not giving my the patience or attention I deserved. We will finally have both weekly sessions in the morning starting next week.