I have done this forever...with whatever therapist I happen to have and sometimes imagining other people too. Mostly I am ok with it and use it to sort of plan out my next session. It does sometimes seem to get a little obsessive, and when that happens I try to find other people to talk to. I have to admit that is one of the reasons I am on this forum...a lot of people are a bit obsessed about therapy. I guess I think maybe it is part of the process. For some reason it helps to get a second therapist too. It's harder for me to be obsessed with 2 of them at the same time.