twenty winks vs zizz

twenty winks

noun

  • A very short sleep, half as long as forty winks. 

zizz

noun

  • A nap or sleep. 

  • A buzzing or whizzing sound. 

verb

  • To take a nap. 

How often have the words twenty winks and zizz occurred in a corpus of books? (source: Google Ngram Viewer )