I do, don't I? You'd be surprised!
Nah seriously, what can you do but do unto others? I'm no believer, but that statement for me has always made a whole lot of sense. When it gets too much and I'm about to lose the rag with her (whether it's justified or not: being called at 5AM and then 6:30 AM to help her use the toilet stretches my patience just a little!) I always try to put myself in her place and think, well, if I had this how would I want people to treat me? Usually works to cool me off and often make me feel just a little ashamed. After all, she has to cope with the damn thing, I just have to look after her.