My MIL has dementia, not sure what type or exactly what stage it is. Anyway, yesterday she told dh that she thought she heard someone in the woods screaming into their fist and someone knocking at her door at 3am. She's told me before that she thought I was knocking on the door at 11pm one night and that she heard it three times. The one time she opened the door no one was there. I'm not discounting that she could have very well heard something and it could have been something causing those noises but are dementia patients known to hear sounds that aren't there?