I think he just says it for something to say but while I'm not saying it's the worst thing in the world it's really really irritating.
Today there was a roast veg thing for lunch and he ate it followed by pudding.
"Ohhh I'm so full ... Oh I'm STUFFED ... Oh I couldn't eat another bite ... I'm so full."
I said tersely in the end "you know no one held you down at gunpoint and made you eat it!"
Then the I'm tired starts, I'm tired, I'm so tired, I'm exhausted.
He says I say I am tired and I do but in response to something, like if he wants to to something I might say I am tired but I don't just walk around announcing I am tired!
AIBU? I don't know why it annoys me so much!