Could it be PND or something along those lines?
Don't think so.
We had a bit of a problem the other week when my sister showed up to our house out of the blue.
I had barely spoken to my sister in close to 3 years because she refused to come to our wedding because I didn't want her dickhead boyfriend there.
Wife has her own problems with her aswell ( sister told everyone that wife was only with me to get with my brother)
So after a couple of days not really talking we went out for dinner without the kids and she thought I was pissed off at her because the way she reacted when my sister showed up. Told her it was fine and that I wasn't too happy about it either.
She hasn't had much sleep due to both daughters waking up during the night and refusing to go back to sleep. The problem is is that I'm a heavy sleeper so I don't hear the kids until they scream the house down.