Explanation:

In the state of meditation the awareness of space exists. In the state of awakening the awareness of the other worldly objects exists. In the state of dream, the awareness of the objects created by mind exists. Only in the state of deep sleep the awareness totally disappears and the awareness of everything is absent. But this does not mean the awareness of God, since here awareness does not exist at all, awareness of God is impossible. When God is aware of Himself, the awareness of God exists and such state cannot be equated to deep sleep where awareness of every thing including God is lost. The totally unknown state of deep sleep indicates the totally unknown state of God and this does not mean the knowledge of God. If some teacher says to a student that he should forget everything and remember the lesson only, this does not mean that the student should go into deep sleep to forget everything including the lesson!