My mom was a sundowner (she did have Alzheimer's). By bedtime, she was an entirely different person.

Just want to clarify, he isn't really crabby...in other words, he doesn't snap at me or whatever. Just looks like my yapping is coming at him like a swarm of gnats! He has NEVER been one for chit chat, whereas I am the poster child. I'll follow him right down the hallway clarifying myself, putting it in different (more) words.

I think what happens is, as he gets tired at the end of the day, he even LESS wants to endure chattering. As I get tired at the end of the day, I seem to lose the ability to flip the shut-up switch!