Sore today

I fell asleep on the couch yesterday evening and woke up there at 4:30 in the morning. I had been sleeping on the right side - the same side where I had had the surgery. That turned out to be a big mistake. I was very sore all day long. That took me by surprise. They told me that the full recovery would take a while but I hadn't had any trouble in a long time. A minor development, really.