I ran into a brief quote by Tolle about dreamless sleep, so I tracked down a book of his and found this passage:
Dreamless Sleep You take a journey into the Unmanifested every night when you enter the phase of deep dreamless sleep. You merge with the Source. You draw from it the vital energy that sustains you for a while when you return to the manifested, the world of separate forms. This energy is much more vital than food: "Man does not live by bread alone." But in dreamless sleep, you don't go into it consciously. Although the bodily functions are still operating, "you” no longer exist in that state. Can you imagine what it would be like to go into dreamless sleep with full consciousness? It is impossible to imagine it, because that state has no content. -Eckhart Tolle, The Power of Now, page 85. It seems obvious to me that he knows not what "witnessing sleep" is. L