Here's the electromagnetic spectrum. Pay careful attention to how much of it we can see:

http://www.lbl.gov/images/MicroWorlds/EMSpec.gif

We can only hear oscillations between 20 times per second and 16,000 times per second. Bats and dogs can hear double that.

The only thing we can see out in space are things burning with the brightness of the sun, things large enough to cause gravitational perturbations visible light years away, and things spewing out radio waves energetic enough to pick it up with a dish.

Much dark matter is basically "Jupiter" - big blobs of gas that happen to not be illuminated by any star. Much of it is likely antimatter. All of it is prosaic and requires no peculiar physics to describe. The only thing that makes it "dark" is our inability to see it, which is a function of it being the fuck and gone far away from any ilumination. If you had a pound of "dark matter" in your living room you wouldn't even notice it because the air would rush in and replace its relative vacuum (well, you'd probably notice some interesting annihilative effects from the antiprotons and such).

Turn your question on its head: "dark matter" is a mathematical inevitability, a side product of the equations that govern star formation. You can solve for it. "Consciousness" on the other hand doesn't come out of any formula we've stumbled across.

Cogito ergo sum, mutherfucker. There is more god in your question than there is in the subject you wish to discuss.