Is it part of the decline when a LO in stage 6 has very long and detailed conversations while he’s sleeping?

Catskie,
No, we are in Canada, he was refer to several specialists.
Now, waiting time for every specialist is about 1-2 years or longer!
As for original poster question, do you notice other symptoms? With PD, dementia, all those things indicate decline. Even hallucinations. But do you notice other things such as profuse night sweating, sleeping more, coughing, choking more, urinating less, eating less, more frail, less active, more pain?
I am becoming aware of disease trajectory more and more and all neurological diseases have similarities.

Evamar,did your husband have a sleep study ? My ex did some strange things in his sleep. Lol

My husband has those one sided conversations while sleeping, never awake though. For months now.
And it would go on and on for hour or more. And in some strange language, lot of screaming, shouting etc.
Apparently could be underlined medical condition, he does not have dementia. Doctors found nothing, suggested taking melatonin. Apparently happens with advanced Parkinson’s.

REM sleep disorders can cause this; with or without dementia.

My Mom did this. She would have times she closed her eyes and she could carry on a normal conversation. It was weird. I think what happens is by closing their eyes they shut out all that is going on around them that can be overwhelming. My Mom did this 2 wks before she passed, closed her eyes and never opened them again. She also did not talk but seemed to know what was being said to her.

I did see this a bit with my brother, Becky, though he had early Lewy's dementia. He was always an active sleeper who would sometimes sort of kick out in his sleep at night, and according to him occ. ended up on the floor at night from having moved about the bed. But when Lewy's hit he had very strange dreams and in fact hallucinations when he got up out of bed, whole detailed visions of garden pool parties, of immigrant woman huddled with her baby in the corner of his room and etc. At night he would talk, though a bit fuddled and incoherently. Sort of as tho some of the disinhibition from waking hours was also taking active role during sleep more than usual.