As far as our daily life is concerned, there are four states of awareness/consciousness:
1. Wakefulness
2. Dream state
3. Deep sleep
4. Being one with the self, oneness of the self.
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By the fourth, it is meant that, you become one with Universal Principle, here it does not mean your are in more deeper sleep, since it is mentioned after the third state of Deep sleep; in the fourth state you are fully conscious and aware of the self, and not sleeping at all. It is mentioned here, because it superficially looks as if one is in a much more deeper sleep, in fact it is sleepless deepest state of oneself, a perfect silence for the individual and in the individual.
For normal humans it is not easy to achieve this fourth stage, it requires, may be life time effort.
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