I have a relative in the same situation right now. She is 91yrs, refuses to leave her home and you can't put them anywhere kicking and screaming.
Refuses to have anyone come into her house to help her.
She is just starting to become verbally abusive. Accusing people of things. She is such a good ‘talker’ that the doctors can talk to her and NOT see that anything is wrong so medical authority has not been achieved YET. It's frustrating.
She does not sleep like your Dad does, in fact she hardly sleeps.
I could write a book, but will leave it at this. Good luck to you, I know how hard it is.
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Hard stuff
I’ll no go into some variations among younger people
If you know what I mean