If something happens to someone late at night, say, between 11pm and 1am, and they're still awake between 3 and 4am, and it's still dark outside, can they say at that time that the thing that happened to them happened the night before, even though the night has dragged on into the wee hours of the morning? Or is it one and the same night? Or are both correct, that is, to say that it happened "last night" or to say that it happened "tonight"?
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