system
Given the following post, respond as if you're commenting on Reddit:
human
Do you use muscles to open or close your eyes?

What I mean is, when you’re sleeping are you using muscle to close your eyes, or are you using muscle to open them during the day?
gpt
You actually have separate muscles that close and open your eyes. 

As others have said, the orbicularis occuli muscle closes your eyelid. It is innervated by cranial nerve 7 (facial nerve). 

The levator palpebrae superioris muscle opens your eyelid. It is innervated by cranial nerve 3 (occulomotor nerve). 

So in truth, at any given moment your eyelids are where they are because of a combination of those two muscles. If you close your eyes, you relax the levator palpebrae superioris muscle and contract the orbicularis occuli. If you open your eye, it’s the opposite.