My Father was diagnosed with Parkinson's five years ago, within the last few months, he has shown signs of sundown syndrome. During these episodes, he is very agitated and confused(very paranoid) worried something is going on, that he does not know about. Can you tell me if the paranoid behavior is side affects from meds, and what can I do do calm him down? I have tried talking calmly, sitting him down, this also is wearing on my mother.