My Dad recently told me that he has woken up in the middle of the night punching the air or battling a nemesis of some kind. The nightmares worry him because he doesn’t want to hurt my Mom. Why do you think Parkinsons patients have nightmares? Is this symptom possibly associated with medication? And have you learned how to manage this issue?
Likely due to REM Behavior Disorder which is thought to be both prodromal to PD as well as symptomatic of PD. Caused by loss of domaminergic cells in the substantia nigra of the brain.