sleepout vs sun deck

sleepout

noun
  • A veranda or other outbuilding used as a sleeping area. 

  • an organised group of people sleeping in the open, often as a form of protest or to raise public awareness of an issue such as homelessness. 

  • a holiday in Africa where travellers sleep away from their home, generally in an open air safari lodge, private home or guest house. 

sun deck

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