Originally Posted by
FireSprite 
I tend to lean toward Redatlanta's opinion though - it sounds more like it has to do with the volume of alcohol in her bloodstream by that time of day more than it is the time of day on it's own..... & that she is likely drinking more than you realize so her behavior is reflective of that. Just my $.02!
This!! I agree that it's more a consequence of the amount of alcohol in her blood stream by that time every night. I bet if she started drinking at 10am or whatever, you'd see the same mouth on her at 5 pm. I can immediately tell how much my AH has drank, and for how long, just by his attitude- mouth. Call it what you want. Once he hits that 3rd beer he's already off to the races.