We get clues from the three state of waking, dreaming, deep sleep. What's our feeling about this waking state? Things are real here. It's very difficult to say that king state is a dream. Why? Because it feels real. This is the conception of brahman in adreta vedante. We take that easiness which is so evident in the waking state and focus on that. Think of this waking state itself as an ocean of esness, existence. Is but do you understand this?
"I, the One, illumine this body and also reveal this universe. Therefore, mine is all this universe or indeed nothing is mine." Inspired by this verse from the Ashtavakra Gita, Swami Sarvapriyananda speaks on the nature of the Self.