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2.
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.
Griigor: I should have my good sleepwank and a nap.
by AnimusNine April 28, 2009
 
1.
To wake up and find you mysteriously have a knackered arm
"ahh shit i must have been sleep wanking all night"
by TMB June 17, 2003
 
3.
The art of having a wank whilst sleeping.
"I had an awesome sleepwank last night dude"
by Pik0r June 17, 2007