asleep at the wheel vs unawares

asleep at the wheel

adj

  • Synonym of asleep at the switch 

unawares

adv

  • Unexpectedly or by surprise. 

  • Without plan or forethought. 

  • Inadvertently. 

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