dead asleep vs dormant

dead asleep

adj

  • Sleeping in a deep sleep 

dormant

adj

  • Inactive, sleeping, asleep, suspended. 

  • In a sleeping posture; distinguished from couchant. 

  • Leaning. 

noun

  • A crossbeam or joist. 

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