Wiktionary
n. An ejaculation or orgasm while asleep, often accompanied by an erotic dream.
WordNet
n. ejaculation during sleep (usually during a dream)
Wikipedia
A nocturnal emission or wet dream is a spontaneous orgasm during sleep that includes ejaculation for a male, or vaginal wetness or an orgasm (or both) for a female. Nocturnal emissions are most common during adolescence and early young adult years, but they may happen any time after puberty. It is possible for men to wake up during a wet dream or simply to sleep through it, but for women, some researchers have added the requirement that she should also awaken during the orgasm and perceive that the orgasm happened before it counts as a wet dream. Vaginal lubrication alone does not mean that the female had an orgasm.
Usage examples of "nocturnal emission".
To the extent Randy believes in any god at all, he's been praying for a nocturnal emission.
A man may dream of love, and of sex, and his body may respond to the point of nocturnal emission—.
A man may dream of love, and of sex, and his body may respond to the point of nocturnal emission&mdash.
A man may dream of love, and of sex, and his body may respond to the point of nocturnal emission-but the experience Helse had given me while she lived enabled me to know the distinction between fantasy love and reality.
With a lurch in the pit of his stomach, Grant realized he had made a nocturnal emission.