sleep-in vs write-in

sleep-in

noun

  • An instance of sleeping in, sleeping late, sleeping until one feels fully refreshed rather than rising at a prespecified time. 

write-in

noun

  • A candidate whose name is not listed on the ballot. 

  • A vote made for a candidate of this kind. 

adj

  • Pertaining to a write-in. 

How often have the words sleep-in and write-in occurred in a corpus of books? (source: Google Ngram Viewer )