Agree - still, I wouldn't call it nothingness... but anyway, doesn't matter...
Well, it seems to know itself via being itself - its all a big mystery...
Sure, we can call reality a dream and vice versa, and ultimately its all the same, but I find it "important" to see that there are layers in this dream/reality.
The most important layer is the one which seems to create duality out of the non-dual dream/reality. Its conceptual thought that creates an alternate dream/reality within the dream/realty. Reality/dream is as it is, unknowable by thought, undefinable etc... but thought still insists on creating a limited universe including all these things and characters (based on what we believe we observe)... Its interesting to see and understand that this seems to happen and that the underlying reality is unaffected, perfectly undivided and whole.