linger vs sit up for

linger

verb
  • To remain alive or existent although still proceeding toward death or extinction; to die gradually. 

  • To consider or contemplate for a period of time; to engage in analytic thinking or discussion. 

  • To stay or remain in a place or situation, especially as if unwilling to depart or not easily able to do so. 

sit up for

How often have the words linger and sit up for occurred in a corpus of books? (source: Google Ngram Viewer )