Fourth state is the ultimate state and the top most goal of every human being.
Waking, sleeping, dreaming are three other states -All are known to every person and animal. Turiya is only available to humans, it represent that state in which we are waking but our mind is not functioning. This state requires lot of practice, focused meditation and Guru’s grace. Once this state is achieved , life will present to us real truth for which we were sent as human.
InnerRealisation 