Pre-sleep fourth state exercise: The secret of a successful passage into the transcendental state consists in insisting on retaining consciousness but not on retaining self-consciousness. For if, at the moment when you are about to slip into the fourth state, you suddenly become aware that you are doing so, then you will at once be hurled back into the ordinary condition. The ego-sense has therefore to subside completely before the pass-over can be effected. So long as the ego knows what is happening to it, so long does the cross-over remain impossible. It must not be allowed to intrude itself at the fateful moment yet neither must consciousness itself be allowed to lapse.
-- Notebooks Category 19: The Reign of Relativity > Chapter 3: The States of Consciousness > # 165