Allan Kardec. The book of spirits (№ 396006)

Question: does the soul Incarnate immediately after its separation from the body?
Answer: Sometimes immediately, but usually after time intervals more or less long. In the higher worlds, reincarnation, there are almost always immediate. As a matter of the body less gross than you have here, the embodied spirit is there almost all the faculties of the spirit; his normal condition similar to the condition of your clairvoyant somnambulists.