Both of my elderly parents - of whom I am caregiving - have some type of dementia. As of the last year or so, and especially the last 6 months, I have noticed a difference in them mid - late afternoon and into the early evening. They get grumpy and nasty, not only with me but with each other. Why does dementia bring about this Sundowner's Syndrome and how do I defend against it? It just drives me crazy and I get really frustrated with the situation being that it is two of them going at it.