This cat does this through the night as well Btw. I have just 'G'cramped a peice of 2x2 to the fence (so it is now 4inches wide) at first, the cat looked at me as if to say "why, you rottern b****, but soon got the idea of it and went to sleep. But as it went deeper and deeper into sleep, It sort of rolls over and falls off. So, what to do? Build a platform wide enough so it cant fall off? I dont want a superstructure on the fence anyway.(the neighbours might think Iam mad. (Hmmm) Double sided tape comes to mind!! But it is a loveley little snow white cat so what can I do? Mr red "does it ever sit on the fence?" we dont call it 'Regan' for nothin you know!!!