Lately (2-3 days) Sully has been acting different. He has been eating and drinking just fine and still talking up a storm, but he just isn't himself. For one, our normal morning routine is gone. In the past I would enter the computer room (where Sully's cage is) and say "Good morning" while I open his cage and put my hand right inside where he would immediately be saying "Come here" and step onto my hand. Now he fluffs up and starts bobbing his head up and down, still chirping and talking, telling me to "come here" but he refuses to come out. I try to encourage him without forcing, but he doesn't want to come out, he just chills in his cage, playing with his toys and chatting to himself. He's also been a bit more nippy lately. What's going on? Any ideas? Can the season change be causing the changes in his behaviour?