night emission vs wet dream

night emission

noun
  • An ejaculation or orgasm while asleep, often accompanied by an erotic dream. 

wet dream

noun
  • An erotic dream bringing the sleeper to orgasm. 

  • An exciting fantasy; a very appealing, ideal thing, person, or state of affairs. 

  • The orgasm in such a dream. 

verb
  • To produce fluids from the sex organs as a result of sexual arousal during sleep; to have an erotic dream; (figuratively) to fantasize (about something, especially in a sexual way). 

  • To have an erotic dream about (someone or something); (figuratively) to fantasize about (someone or something) sexually. 

How often have the words night emission and wet dream occurred in a corpus of books? (source: Google Ngram Viewer )