Like, is it just total darkness or, the opposite? Is it easier for them to fall asleep given that there’s no light to distract them whilst trying to nod off?
I feel like an absolute ass for asking these questions, and I’m honestly not trying to hurt anyone’s feelings or anything.
There’s different levels. My wife knows someone who can see just from the extreme periphery of her eyes. My dad worked with a guy who could barely make out shadows in bright light.