My father has been a Parkinson's pasties past five years and been on medication. Past two months he has been showing sundown syndrome symptoms.. He is always suspicious about things going around. During evenings I always see a change in his behaviour..he becomes moody, confused and a fear that someone is standing near the window. All of this is taking a toll on my mother .I tried confronting him about this syndrome but he is in a denial mode. He is very sure that something suspicious is going around him. Kindly help !!