The Central Unsolved Mystery of Neuroscience

The circuits that underlight dreaming are extremely ancient. They're just doing a basic architectural job of saying, Hey guys, every 90 minutes just blast some activity into the back of the brain there. And they don't know if you're blind or not. Now, speaking about dreams, I guess it's not too much of a leap to start talking about consciousness. The question is, how do you take 86 billion cells and stick them together and hook them up in such a way that you have private subjective internal experience? This still remains to my mind the central unsolved mystery of neuroscience.