sorcery of sight eli5

Question

sometimes when i sleep, i do so with both of my eyes open. what’s the internal process that’s preventing me from seeing what my eyes see while that’s happening? how come i don’t see both the waking and dream world sort of layered over each other?

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Answer 1

not an expert in any field, but I’m assuming it’s the same reason why you can lose awareness of your surroundings while in deep thought.