Brain uses a lot of information that one is not consciously aware of, too. For
example, you can be unconscious, but your brain still keeps your body alive by
processing information about your internal state. So we may say, our
consciousness is never complete. It also shifts in and out of existence when
we sleep, or are anesthetized. It 'moves around' when you are focusing your attention on different tasks.
The brain work much as classifier of things. As such, a complex enough
brain is very well able to connect everything that happens inside your body as
belonging together. Our actions, body state, emotions, and thoughts are
combined to create a new 'feeling' or 'concept' of yourself. and again, sometimes you are thoughts, or emotions. when you are really engaged and deeply focused on something, I think you can sometime even un-aware of yourself.