Does anyone else have any good "sundowning strategies?"

I am evil! At least, according to my Mom. If I were a good daughter, I wouldn't keep her a prisoner! I would fix her spine so she could walk! I would help her stand up even though she hasn't been able to stand for over a year! I am so evil and awful and other foul-language things that i won't repeat. Sigh. I'm just venting, really, don't have a question. I try to keep a good sense of humor. When I try to help my Mom stand, because sometimes it is easier than trying to explain that she can't, THEN she gets mad at me for not telling her she can't stand. I find myself baffled and amazed at how our brains can turn to pudding. She wants to get out of here and I am keeping her prisoner! The one strategy that works fairly well is to call her grandson, my son, and have him tell her he will be coming to take her "home." It will take several hours for him to get there, though, so don't be in a hurry. My Mom is off the norm--she tends to do her sundowning about 2 p.m.