Acting out dreams while sleeping

yes unfortunately it’s somewhat common and more common in some forms of dementia. this explains it: Dementia can cause vivid dreams, but it also triggers hallucinations (seeing/hearing things not there) and delusions (false beliefs) due to brain changes, especially in conditions like Lewy Body Dementia (LBD), where acting out dreams (REM sleep behavior disorder) is common. While dreams are normal, dementia's impact blurs reality, making hallucinations a key symptom, often visual and sometimes frightening, though they can also be benign; understanding the difference and the underlying cause (like LBD or infections) is crucial for care.  talk to his doctor about medication to help.