The night that automatically starts after the party on Friday - she definitely has lower wakefulness gain rate compared to standard night without giving her any items before it
You could do an experiment: set up a stopwatch, start the night after the party, choose one interaction (like blowjob) and see for yourself how much time it takes for the wakefulness icon to fill up, then do the same thing on any other night
There will be a difference in seconds, not minutes, between the two time readings