Astral projection

In occult terminology, the partial or complete separation of the astral body from the physical body, and visiting another locality, near or far. This occurs in sleep – though, as a general rule, one does not recall the experience on waking. The adept can command his astral body to go any place he desires in order to make observations and investigations, and acquire essential information. Some dreams are the result of such travel episodes. 

DeVore, Nicholas. Encyclopedia of Astrology. New York: Philosophical Library, 1947.