My father brought home 3 identical kittens, so identical that we had to buy different colors collars to be able to tell them apart. The vet kept saying that we would be able to tell them apart as they got older, wrong. As soon as you think that you have their actions figured out they change. (Example: Zazu is always the one who climbs the curtain, while Bailey sleeps all day. I just yelled at Zazu to get off the curtain and it was Bailey, Zazu is asleep with the dog.) But lately I can't get Zazu to do anything. He is usually running around, fighting with his brother, Oliver, chasing bailey or me or the dog, climbing everything, playing with toys or anything that he can see. But now every time I go to check on him he's asleep in the same spot and he stays there from when I let him out in the morning to when I go to bring him in at night. Should I be worried about him or could he just be the oldest of the three? He is really starting to worry me.