Advaita Vedanta says that this alone is real. These are appearances, these are projections of the self. For us, we have these experiences and this is real. After enlightenment, what will happen is, not that these will not be experienced. But for the enlightened person, this is the reality. It's not a fourth state, fourth aspect of the Atman. It is the reality which projects itself."
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Karika 1-5.