dormitive vs half-asleep

dormitive

adj

  • Causing sleep. 

noun

  • A medicine to promote sleep; a soporific or opiate. 

half-asleep

adj

  • Showing signs of being asleep or very sleepy, as not demonstrating full energy or attention. 

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