A nocturnal emission or wet dream is a type of spontaneous orgasm involving either ejaculation during sleep for a male or lubrication of the vagina for a female if she perceives that it resulted in an orgasm. Nocturnal emissions are most common during adolescence and early young adult years, but they may happen any time after puberty. It is possib... Found on http://en.wikipedia.org/wiki/Nocturnal_emission
(from the article `dream`) Nocturnal emission of sperm remains to be described in terms of any distinguishing EEG pattern; such events are extremely rare among sleeping ... Found on http://www.britannica.com/eb/a-z/n/47