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1.
The act of ingesting an entire bottle of sleeping pills and then attempting to whack off before falling asleep.
Martyn: You guys ever tried sleep wanking?
Zach: Yeah! It's great cause you always win
Steven: Unfortunately you can never stay awake long enough to clean up the mess...
Lads: Aye!
von Martyn with a 'y ' bitches 26. Juli 2008
 
2.
Indulging in the act of masturbation while sleeping, usually performed by a man during a period of sexual frustration.
Tim has never had sex. One day, he woke up in his bed with a puddle by his side; he was sleepwanking.
von Elvis O'Keefe 26. September 2011