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.
by Elvis O'Keefe September 27, 2011
The act of wanking prior to sleep, so as to improve the quality of your rest and also have an excuse to think of unfuckingbelievably hot chicks.
by AnimusNine April 29, 2009
by Pik0r June 17, 2007