look through vs sleep on

look through

verb
  • Used other than figuratively or idiomatically: see look, through. 

  • To appear or pretend not to see something or someone who is clearly visible. 

  • To take a view of the contents of; search in, either with the eyes or by hand. 

sleep on

verb
  • Used other than figuratively or idiomatically: see sleep, on. 

  • To postpone (a decision) at least overnight, to avoid making a hasty choice. 

  • To miss or ignore, usually used when attesting to the quality of something. 

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