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false dawn 

When dawn is observed on the horizon and you are not ready for it. Often times occurs while out drinking all night or during finals in college. When observed, it is best to ignore the false dawn until there is no denying that it is morning.

Origin:
Phrase first spoken after an all night drinking session before morning piano movement
All night spent drinking in hot tub
David:"Is it daylight already?"
John: "Nah, thats just the false dawn, ignore it."

Finals week all-nighters
Allen: "You ready for this test?"
Jeremy: "I'm about half there... shit, is that the false dawn? What time is it?!?"
false dawn by manabouttorock December 28, 2011
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