Here’s a neat trick to imagine what it could feel like. Close both of your eyes. You see darkness, right? Now close one eye and leave the other one open. You don’t really “see” anything out of that closed eye at all. There’s no darkness. There’s just nothing there.
I saw that some blind people actually have difficulties falling asleep. Because they cant see the sun, their circadian rhythm and they’re sleep/wake signals are all out of sync.
What could that possibly mean??