Anyone dealing with vascular dementia and nighttime aggression?

My husband suffered a significant brain bleed last year. His recovery has been a real rollercoaster. Great progress, walking, talking, participating in therapy, capable of doing most things on his own. His biggest challenge is memory related. No short term memory and at times, he doesn’t know me, typically when he first wakes or is very tired. Lately, though, around 7:00 pm, he gets a loop in his brain, a fixated notion that, for example, the glass of milk needs to be thrown off the table. I have tried to redirect, but to no avail, until that glass goes crashing down. So yes, switching to plastic. After, he is scared and apologetic. Any advice? I have been giving him ativan at the first sign but any other med suggestion?