peep of day vs sunlight

peep of day

noun
  • break of day; daybreak 

sunlight

noun
  • Synonym of sunrise. 

  • All the electromagnetic radiation given off by the Sun, especially that in the visible spectrum that bathes the Earth. 

  • Brightness, hope; a positive outlook. 

verb
  • To work on the side (at a secondary job) during the daytime. 

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