Top Definition
Staying awake all night because you forgot to go to sleep. Generally associated with MMORPG addicts.
Eric is going to be late for work today because he was up all night with insomamnesia.

Bill: You look like shit Paul.

Paul: Yeah, I was up all night playing WoW.

Bill: Classic case of insomamnesia
by Despondence April 14, 2010
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