Atma Chaturshpat: The self has four aspects, waker, dreamer, sleeper, and thorium. "You should start thinking of yourself as the fourth," he says. After realization, when I get samadhi, it won't be any problem at all", Atma adds.
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Mantra 7 (Part 2).