I feel like I've only had one or two "wasted" sessions and I think it was because I was really tired and my mind was working really slow. I didn't really feel like I had anything to say and I could never come up with a response to T unless she asked a question. I like to write down a couple of notes after every session so I can remember what happened and even though I left feeling like it was wasted, I still had things to write down so maybe it wasn't all a waste.