The term used for amnesia after a night of Ambien or other sleeping/anxiety pills.
Bruce realized he was suffering from Ambienesia when he woke up this afternoon with "Marco" shaved into his chest hair and lipstick on his calves.
by Couch. December 18, 2009
The state one falls into after the sleeping pills take effect, but before one is actually asleep. A person experiencing ambienesia will often seem a little loopy, and will do and say things they wouldn't do under normal circumstances. The person will have no memory of the events.
Dude, I totes said I love doing yard work in that essay I wrote last night. I think I have Ambienesia!
by Phantasmagoric November 14, 2012