my therapist comments when I choose to not sit on the couch (she also has 2 chairs) and I feel different on the days I choose to not sit on the couch, sometimes making that decision way ahead of the session and other times not until I walk into the room.

I was aware recently when I was going to choose the chair, but when I got in the room I definitely thought the couch seemed right. I'll have to see if it is related to how I'm feeling (age-wise) at the time...