I am sharing an informative quotation on Three states of existence by Ramana Maharishi. Those who are not interested to read can ignore.
Question: For one who has realised his Self, it is said that he will not have the three states of wakefulness, dream and deep sleep. Is that a fact?
Sri Ramana Maharshi: What makes you say that they do not have the three states? In saying “I had a dream; I was in deep sleep; I am awake”, you must admit that you were there in all the three states. That makes it clear that you were there all the time. If you remain as you are now, you are in the wakeful state; this becomes hidden in the dream state; and the dream state disappears when you are in deep sleep. You were there then, you are there now, and you are there all the times. The three states come and go, but you are always there. It is like a cinema. The screen is always there but several types of pictures appear on the screen and then disappear. Nothing sticks to the screen. Similarly, you remain your own Self in all the three states. If you know that, the three states will not trouble you, just as the pictures that appear on the screen do not stick to it. On the screen, you sometimes see a huge ocean with endless waves; that disappears. Another time, you see fire spreading all around; that too disappears. The screen is there on both occasions. Did the screen get wet with the water or did it get burned by the fire? Nothing affected the screen. In the same way, the things that happen during the wakeful, dream and sleep states do not affect you at all; you remain your own Self.
Question: How are the three states of consciousness inferior in degree of reality to the fourth (Turiya)? What is the actual relation between these three states and the fourth?
Maharshi: There is only one state, that of consciousness or awareness or existence. The three states of waking, dream and deep sleep cannot be real. They simply come and go. The real will always exist. The “I” or existence that alone persists in all the three states is real. The other three are not real and so it is not possible to say they have such and such degree of reality. We may roughly put it like this, Existence or consciousness is the only reality. Consciousness plus waking, we call waking. Consciousness plus sleep, we call sleep. Consciousness plus dream, we call dream. Consciousness is the screen, on which all the pictures come and go. The screen is real, the pictures are mere shadows on it. Because by long habit, we have been regarding these three states as real, we call the state of mere awareness or consciousness the fourth. There is however, no fourth state, but only one state.
There is no difference between dream and the waking state except that the dream is short and the waking long. Both are the result of the mind. Because the waking state is long, we imagine that it is our real state. But, as a matter of fact, our real state is Turiya or the fourth state which is always as it is and knows nothing of the three states of waking, dream or deep sleep. Because we call these three Avastha (states) we call the fourth state also Turiya Avastha. But it is not an Avastha, but the real and natural state of the Self. When this is realised, we know it is not a Turiya or fourth state, for a fourth state is only relative, but Turiyatita, the transcendent state.