I'm so sorry you are going through this with your Mil. My Mum, who has lived with me for 4 years, and for whom I am sole carer, seems to have sunrising, noonrising, sundowning and moonrising!!! The only time she's ok is when I take her out in the afternoons, which I do every day. I don't know how much more I can take of it. I've called the doctors a couple of times and they just say it's her dementia and nothing can be done so I struggle day in, day out with it. I love my Mum and want to care for her until the end but I'm starting to wonder if I will be able to at this rate! If you find a solution, let.me know!!