be in the land of Nod vs slumber

be in the land of Nod

slumber

verb

  • To be inactive or negligent. 

  • To be in a very light state of sleep, almost awake. 

noun

  • A state of ignorance or inaction. 

  • The snooze button on an alarm clock. 

  • A very light state of sleep, almost awake. 

How often have the words be in the land of Nod and slumber occurred in a corpus of books? (source: Google Ngram Viewer )