Before we go on to enlightenment, full-blown realization, what the Upanishad wants us to sit down quietly and consider the concepts of waker, dreamer and deep sleep. So for that, it gives us an exercise. Meditate on yourself as the waker. These are thought experiments like your brain in the vat. It's called a meditation in the Upanishads. There are many of such thought experiments. They expand our understanding and prepare us for enlightenment. To meditate, you need a place to meditate. That's because to concentrate, the mind needs a place to concentrate on. If you force me to choose, where are you, that individual being right
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Karika 1-5.