Rudolf Steiner,
An Outline of Occult Science
“ During the period of life between birth and death, separation of the etheric body occurs only in exceptional cases, and for no longer than a brief space of time. If, for example, a man exposes one of his limbs to pressure, part of his etheric body may become separated from the physical one. We say on such occasion that the limb has “gone to sleep,” and the peculiar sensation we feel results from the separation of the etheric body. ”
