perhaps some people have eyes in their brains and just don’t know it.

does this mean that when they close their eyes the darkness they see is really the inside of their skull?

Of course. And the voice inside their heads is another mouth that developed and wants to be friends.

perhaps some people have eyes in their brains and just don’t know it.

Your eyes technically are part of your brain.

But it’s certainly not unheard of. Parietal eyes have existed for a good while now.

What’s up with your link?

en.wikipedia.org/wiki/Parietal_eye

Spoiler

It’s just like a lizard/fish thing. No mammals.

Parietal eye - Wikipedia