This resonated with me instantly, thank you!

I now remember, I used to do something similar if I needed to make decisions, even minor decisions, when drunk. I'd say, "what would I think of this decision sober"? If the answer was "it was silly" or "I'd want to do it but be embarrassed" I'd go ahead and do it. But if the answer was "Eek, obviously unsafe", I'd assume my sober self was right and I was currently overconfident.