[lastdayy]

Umm, no. Plenty of people have outward personas that they can maintain through extreme intoxication.

Guy Burgess was well known when a British diplomat for protracted alcohol binges accompanied by all sorts of poor decision-making, but he never let slip that he was a Soviet spy.

[aklein]

Not to mention Sasha Baron Cohen passing out from wine and waking up in character as Ali G - at least anecdotally