Dad has some mild to moderate dementia. He's sleeping more during the day now that I got him a comfy recliner (so not that good). I've noticed he has full-on conversations with himself.... sometimes quite agitated conversations. He seems asleep but must be in another half-way state. Is this a hallucination do you think? Or just normal old age weirdness? When he wakes is is often quite sure we've been having a conversation!
This is what I remember reading about, in that the normal inhibition of hitting out, talking, even getting out of bed, is not working. It MAY be associated with Lewy's Dementia, and is known to occur with Parkinson's Disease. But it may be present in some people throughout much of adult life.
Can find out tons about it online.
Later she'll ask me, "Did I talk to so-and-so, or did I dream it?"