My father, the same. Had Huntington’s and Leweys. Some of the episodes were shorter than others. Loss of muscular control and/or speech for a short while, then ‘normal’ again. They were called mini-strokes by his doc.
I don’t think her Dementia is leweys. That is the one with hallucinations. She has wild dreams and sometimes gets confused about dream vs awake, but never a hallucination. Yet. I’m sorry for what you went through. When he starting having the mini strokes, was that the beginning of the end?