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The sudden feeling of sleepiness or exhaustion felt the moment one is invited to a social function or activity, which usually results in avoiding that function or activity;
an excuse of having 'plans early the next day' is typically feigned, albeit poorly.
Person 1: "Hey, it's Saturday! Do you want to get some dinner and see a movie tonight?"

Person 2: "Nah, I'm kinda tired & don't want to be out too late. Plus, I have to get up early for work...on umm,..Monday".

Person 1: "Ah, sounds more like a case of social narcolepsy. (rolls eyes) Whatever."
by Marlise M. Tkaczuk November 08, 2008
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