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.

Twitching and jumping may be little mini seizures (myoclonic) or the preface to them. When your brain pathways don’t function normally the electrical signals go haywire causing seizures. In my sister’s case they eventually led to full tonic-clinic(whole brain, whole body) seizures. (We used to call them grand mal.) These in turn became more frequent and led to medicating with Keppra. Keppra has been shown to most effective in AD patients. The Keppra reversed things for a year and improved her thinking. I was thrilled. The brain pathway deterioration progresses over time with Alzheimer’s and the jumps & jerks of mini myoclonic seizures led to the return of tonic-clinic. When Keppra dosage was at max over time, Depakote was added and seizures have been reduced again. I highly recommend and encourage you to talk to your doctor and proactively discuss the jumps and jerks. Ativan is often prescribed as a sleep med for AD. Ativan is the first drug given to patients usually in emergency situations with seizures to curb the seizures quickly. It might be that when Ativan is used to help sleep, it is curbing the electrical disturbances that cause seizures. Don’t think the jerks and jumping can’t be addressed to improve quality of living because AD progression seems unstoppable. 🧐

My husband's body moves a lot when he's asleep. I think he must be dreaming he is doing some task. His arms and hands look like he's trying to fix something.
He also talks a lot in his sleep Some of it I can understand but mostly I don't know what he's saying.

Yes, my husband dies that quite often when he’s asleep. He sometimes does it when he’s awake. Patients with later stages of Alzheimer’s sometimes develop tremors which appear to be seizures. And, other times they ca have seizures. My husband’s are mild because his Neurologist for Brain Health has himon medication whine helps him. Be Blessed
.Pat