My Mom has episodes of vivid dreams/hallucinations/personality change often...anyone else seeing this?

She is 93. PWP, and I've been her 24/7/365 carepartner/giver for 8 yrs. She's very negative and 'can't do' most of the time until these 'episodes' start. They last for a couple of days during which she talks all the time while she sleeps, see's things that aren't there while she's awake, and tries to do stuff that she swears she can't do any other time. The odd thing is, she's more cooperative during these 'episodes', more like the person I used to know. Anyone else dealing with this type of thing? Thanks.