Binaural Beats and Isochronic Tones
According to Wikipedia, astral projection (or astral travel) is an interpretation of out-of-body experience (OBE) that assumes the existence of an "astral body" separate from the physical body and capable of traveling outside it. Astral projection or travel denotes the astral body leaving the physical body to travel in the astral plane. The idea of astral travel is rooted in common worldwide religious accounts of the afterlife in which the consciousness' or soul's journey or "ascent" is described in such terms as "an... out-of body experience, wherein the spiritual traveller leaves the physical body and travels in his/her subtle body (or dream-body or astral body) into ‘higher’ realms." It is therefore associated with near death experiences and is also frequently reported as spontaneously experienced in association with sleep and dreams, illness, surgical operations, drug experiences, sleep paralysis and forms of meditation.