lethargy vs sensation

lethargy

noun
  • A condition characterized by extreme fatigue or drowsiness, deep unresponsiveness, or prolonged sleep patterns. 

  • A state of extreme torpor or apathy, especially with lack of emotion, energy or enthusiasm; (loosely) sluggishness, laziness. 

sensation

noun
  • A physical feeling or perception from something that comes into contact with the body; something sensed. 

  • A widespread reaction of interest or excitement. 

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