The involuntary action of manually manipulating one's genitals during REM sleep. This phenomenon is responsible for some unverifiable portion -- scientific estimates point to 5-10% -- of nocturnal emissions. It is rarely discussed in polite conversation, but is assuredly real. When caught in the act by an incidental third party observer, the awoken offender is often characterized by denial and defensiveness. The following sample text is a rare exception.
The act of Sleepsterbation is not under much debate. Although some believe it to be a myth, The truth behind the hidden art of Sleepsterbation lies in the cycle of sleep known as "rapid eye movement" (or REM.) While many can not control their physical movement while in this dream state, some "seasoned veteran's" are more adept at controling basic arm movements such as wiggles or sudden jerks. While not actually masterbating, the sudden jerks or wiggling of the arm causes the practitioner to become aroused and have a nocturnal emission.
Most consider it to be nothing more then a wet dream.
one who rubs themselves in their 'special place' while sleeping. The purpetrator is usually completely unaware of his jolly good timein the morning.
rob: *rub*rub*rub* "ZzZzZzZzZz"
jack: hey everyone look, alan is sleeperbating everyone: jeez, he's getting more action than a 2 dollar whore.
jack: yep. he's a very talented sleeperbater.