Bears are a bit like cats, Susan. They both look cute but you don't want to argue with them ;-)
My sleep patterns have also always been a bit weird but the cancer treatments last year made them even stranger and they're definitely now all over the place. I spent most of Friday in bed (accompanied by both Chequers and Moonbeam) after having gone to bed at around 5am. I got up at 6pm and I'm now about to retire again if that cats will let me.
I'm sitting on the front edge of my office chair at the moment because Tablo is taking up most of it. It's an uncomfortable position, made worse by the fact that Chequers has just jumped onto my knee. When I eventually get upstairs, I'll have to work out how to fit into my bed without disturbing Moonbeam, who's fast asleep on it ;-)
I hope that your back (etc) is feeling better and that you'll be able to sleep well.