My husband also has a lot of twitching and hand gestures while sleeping.thinks he hears knocking on door. Things happening outside. Yells out in anger in his sleep. Hallucinations more frequent now also. I just have to keep being more watchful and talk him around these episodes. Think that's all I can do at this stage. What bothers me most though is when he rearranges cupboards by dragging everything out then dosen't know what to do then. Loses focus. Today he filled his nebulizer cup with water out of his water mug instead of using medication. Caught that one in time, thank goodness! Like small child looking for mischief sometimes.

My husband started the sleep twitching, talking, and occasional night terrors a few years before his diagnosis. We were told he has REM sleep disorder. It does not allow him to go into a deep sleep. He fights day time fatigue. Also has made it difficult for us sleeping together. No more snuggling. Constant movement keeps me awake. 50% of people with REM develop dementia.

My husband does all the movements and talking all night too We have given a sleeping pill at night which most nights prevent him from getting up and wanting out The movements are still there but he does sleep through them 🙏

Tremors...could also be Lewy Body. My husband has tremors. After he was finally diagnosed with Lewy Body He was put on Sinemet (a Parkinson’s medication). People with Parkinson’s also have Lewy bodies in their brains. Sinemet has helped his tremors greatly.
Be sure to tell the doctor about the tremors.
Unfortunately Lewy Body is majorly unidentified.