I reckon it's always the way, Mel.
Just when you think it can't get any worse!
I know there's be a couple of times where I've said to myself, "Ok... I can't do this anymore!". Then the next day she's as good as gold!! Almost like they like to drive you right to breaking point - just before the nervous breakdown - then stop!!
From what I have heard, I think it keeps happening until they are well past their teens... maybe even further!! Who'd have kids, hey??