system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What do we see when we close our eyes?

You know, when we close our eyes we see some random dots, lines and forms, what's that?
gpt
They’re called phosphenes and researchers believe you are actually seeing light that is originating from your eye itself. Basically our eyes are capable of producing "biophotons" which is essentially the same thing fireflies use to light up. Most the time these are lost in the light of the regular day and your brain just processes them out, but when you close your eyes, it sometimes takes a while for you brain to process out the light signals as nothing more than "noise" from your own eyes, rather than something it is actually seeing in the real world.