Top Definition
Sort of like Amnesia.

It's when you have a late night conversation (usually while on the phone), while very sleepy. The next morning, you forget what you were talking about towards the end of the conversation.
Guy 1: Remember what we talked about last night?
Guy 2: Uhh... No, I think I have sleepnesia...
by RawrItsPanda November 11, 2009
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