Well what can I say about Burt! He's got the devil in him, he's awake constantly, never stops running about. My older cat Eddie goes through so much.....poor thing! Burt just won't leave him alone, he jumps on Eddie bites him pulls his fur out, he can be quite vicious, Eddie does swipe back at him but I think he's had enough and just runs off. I'm hoping he will grow out of it, apart from that he does sit with me now and then and purrs away and sleeps on my head.