In a mystical experience, can the experience this consciousness? Answer is yes and no. If you experience your consciousness, it must be dressed up in some name or form,. This is not an objective experience. It is always the experiencer. We are talking about something beyond God. The skeptic says, I and my world are experienced. They are real. But Advaita Vedanta wants to say, yes, they are as real as this table and chair. There is a greater reality beyond the table and chair which is, which is the absolute.
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Karika 1-5.