If you suddenly found that you were having a lucid dream you would not immediately test out your relative super-powers but would instead stop whatever it was you were in the midst of doing and carefully examine the material texture of the world in which you found yourself. You would want to bring about the sharpest juxtaposition of the certainty that all of this was mind-generated with the quality of infinitely rich layers of texture that material objectivity must have in order to pass the tests of independent reality. You would not want to waste an opportunity to view the imaginative constitution of the world from the other side of the tapestry. There is no need to wait for a lucid dream to do this, you can 'bracket away' the absence of the certainty that you are dreaming and perform the same kind of scrutiny with ordinary waking reality. If it helps, why not accompany this with the thought '(this is) experiencing'. Such a thought seems the furthest 'upstream' you can go, it is certainly prior to any notion of the 'I' and to the so-called natural attitude, and best of all it is prior to itself.