The Spirits' Book
Book Two - The Spirit World
Chapter VIII - Emancipation of the Soul
Sleep and Dreams
407. Is complete sleep necessary for the emancipation of the spirit?
“No, the spirit recovers its freedom as soon as the senses become drowsy. It takes advantage of every moment of bodily rest to be free. The second that the body begins to get weary, the spirit detaches from the body. The weaker the bodily state, the freer the spirit.”
This is why dozing, or a mere dulling of the senses, often presents the same images as dreaming.