What information supports the idea that food should not be left out overnight?
https://www.google.com/search?q=why+food+should+not+be+left+out+overnight&oq=why+food+should+not+be+left+out+overnight&aqs=chrome..69i57.8769j0j7&sourceid=chrome&ie=UTF-8
Read many of these articles so you get the whole idea.