Why do we even dream?

Laying in your bed, staying awake for some reason. You can't seem to shut your eyes, the shadows look like a demon. You force your eyes closed, but still got that feeling.

Now you're sleeping even though you didn't try. Huh, what the fuck is going on? I'm flying? Through circles of clouds, sky bluer than reality. Wait! No, I'm falling.

Why is it happening, I don't know.. But it is happening for sure. Why are there missing pieces of the world, they look like they got deleted from the world. Eyes? The eyes are following me, but they're comforting?

Why why why? What the fuck is this fever dream? What does it mean? Why do we even dream? Where do they come from? It's like they just exist, and no other threads to connect it to. All loose, no vague ties. Just... Nothing.