Deep sleep brings on a sense of non-dualistic or Advaitic peace with it. This
experience one gets only in the absence of mind, which is in the form of the
universe. When one focuses his attention consciously on the formless witness (soul)
of the three states then which wards of the ignorance, which is the cause of
the mind (duality/illusion) and it itself
is uncaused.
So, one gets to the real nature of the soul or consciousness by
focusing the attention on the formless witness, consciously and at the same time
by being aware of the body and the universe and know them consciously as
consciousness alone.
Once one becomes fully aware of the fact that whatever exists as an
object (body + universe) with form or shape are also consciousness because they
are made of consciousness.
Thus, the deep sleep illustration can be utilized the real nature
of the soul or consciousness, which is
without duality (forms and shapes). Thus remaining in duality becoming
aware of the soul, which is present in the form of consciousness, is the
innermost self is Self-Realization.
