Does this make sense to you?

Yeah... no. Science can exactly explain how we function while we sleep - we have subconscous areas of our brain that perform vital homeostatic functions while we sleep, just like while we're awake. Ever heard of the hypothalmus?

I think you took my first line too directly. Science does not know everything about the human body and its inner functionality, sleep was just a metaphor I used to describe a different state of consciousness. Tho, that is not my point. My point is that we as a human being does not require the complicated knowledge of how our body operates in order to operate it. That "ignorance" seems solid enough to say that our brain has higher functionality that our consciousness does not fathom. This vast ocean of knowledge are completely untouched to us human, yet everybody knows how. We learn about a human body through examinations and analysis, not decyphering how our higher subconscious works. Even your statement refers to subconscious areas in our brain. It is somewhat aligned with the statement "mankind operates in a limited state".