down for the count vs out like a light

down for the count

adj
  • Unconscious or sound asleep. 

  • Decisively beaten; defeated; rendered irrelevant for the long term. 

out like a light

adj
  • Asleep or unconscious, particularly if this has occurred suddenly and the sleep is deep. 

How often have the words down for the count and out like a light occurred in a corpus of books? (source: Google Ngram Viewer )