high tide vs night emission

high tide

noun
  • Synonym of menstruation 

  • The natural tide at its highest level for a particular tidal cycle at a certain place. 

  • climax, culminating point or phase 

  • The time of day when the sea has risen to its highest level. 

night emission

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

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