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A phenomenon which leads one's English (or whatever language one speaks) to either become less controlled or logical than usual or archaic and verbose; it also causes one to say things one wouldn't ordinarily say. Often quite embarrassing, this syndrome is most evident in those who chat or speak with friends or relatives in the wee hours of the morning.
Deb: I'm sorry about last night!! It was late, and I don't know what I was saying!
Pedro: No worries--I'm sure it was just the 4 AM Syndrome.
by BostoniensisXX August 08, 2013
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