My cockatiel, Apollo, has recently started napping during the day on the bottom of his cage instead of outside on top. He still tucks one foot under him when he naps, but he just started doing this about three weeks ago or so. His droppings still look normal and he is still eating and so far I haven't seen any other alarming signs showing he may be ill, but I was wondering why he would start hanging around the bottom of his cage when I never seen him do this before. He used to love staying outside of his cage all day long, but now, although he still climbs out and spends some time outside the cage, he seems to perfer staying inside it now....as long as his door remains open. He still sleeps on his perch at night like he always does. I got him in October of last year and I was told he was around 2 years old, but I honestly don't know how old he is. Does anyone here have any thoughts or ideas as to what may have suddenly caused this behavior?