Do dementia patients see spirits?

If you’ve ever seen anyone with dementia or Alzheimer’s you might know why I’m asking this

I’ve known a few ppl w dementia and when they get into the later stages they start seeing things or hearing things I wonder if they’re actually real spirits talking to them or attacking them or if it’s just genuinely hallucinations I’ve read that some ppl believe it’s real spirits and they take advantage of them bc they’re more vulnerable and feed off of that scared energy but I’m curious what people’s thoughts are here I’d love to have a conversation about it and learn more (obvi I haven’t asked the ppl w dementia abt it just in case and I don’t want to scare them more)