drowse vs nightmare

drowse

noun
  • The state of being sleepy and inactive. 

verb
  • To nod off; to fall asleep. 

  • To be sleepy and inactive. 

  • To advance drowsily. (Used especially in the phrase "drowse one's way" ⇒ sleepily make one's way.) 

  • To make heavy with sleepiness or imperfect sleep; to make dull or stupid. 

nightmare

noun
  • A feeling of extreme anxiety or suffocation experienced during sleep; Sleep paralysis. 

  • Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure. 

  • A very bad or frightening dream. 

verb
  • To have a nightmare. 

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