We have a hard time remembering that humans used to live outside, all the time, 24/7, every day. With bright moonlight, early sun rise and late sun set. Along w

We have a hard time remembering that humans used to live outside, all the time, 24/7, every day. With bright moonlight, early sun rise and late sun set. Along with being near active fires. It's going to take a lot of research to convince me humans just never adapted to light for sleep.