That’s a leading theory. Afraid of the dark? It’s evolutionary adaptation to living side-by-side with humans who could see in the dark: and yes, Neanderthals could.

> Neanderthals could

proven how?

Science!

https://www.bbc.com/news/science-environment-21759233

https://www.ox.ac.uk/news/2013-03-13-neanderthal-brain-focus...

https://www.sciencedaily.com/releases/2013/03/130319093639.h...