The ultimate reality, brahman or atman, is totally useless. All use, all transactions of the world are based upon it - but it in itself is not available for use in this world. The real self is not the waker, not the dreamer, not the deep sleeper. What experiences do we have internally, things that we can think and imagine? All of those are denied. That continuous eye which is there in the waking which isthere in the dreaming, also there in the deep sleep. Who experiences my waking life? I whatever that eye is. And in the dream too, i dreamt, like the tetice said, you were present in the you are