I know what you mean about tiredness equating to silliness. I have a very weird sense of humour that I keep in check most of the time, but as I get tired I reach a point where I don't control it very well and the mouth engages before the brain can do anything :)

I've never been (hangover) drunk , but I strongly suspect DrunkMe would be ten times worse then TiredMe. (Or I'd be REALLY obnoxious - again, not checking things that I say.)