Psychology Says People Who Prefer Sleeping in Complete Darkness Are Processing Ancestral Threat Detection Patterns That Most Humans Have Lost
Have you ever noticed how some people absolutely cannot sleep unless the room is pitch black, while others happily doze off with a TV flickering, a streetlamp pouring in, or fairy lights glowing? That intense, almost non‑negotiable preference for total darkness is more than just a quirky sleep habit. It taps into something very old ...












