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This chapter considers two kinds of out-of-body experiences: lucid-dream out-of-body experiences and bion-body out-of-body experiences. The chapter sections are:
Dreams need no introduction, because dreaming is an experience most people have. However, there has long been the question as to the location of dreams. Some past cultures believed in a separate dream world, which exists around the dreamer—when a person dreams, the mind of that person is moving about in that dream world. Call this kind of dream an external dream (what is commonly known as a lucid dream is an external dream). The alternative is that dreams are spatially confined to the dreamer’s head. Call this kind of dream an internal dream.
The mathematics-only reality model cannot explain external dreams, and according to that model all dreams are internal. The computing-element reality model allows both kinds of dreams.
For an internal dream, the imagery and sounds of that dream are generated by brain bions, without using substantial sensory input. It is certain that the mind can generate high-quality images and sounds without sensory input, because most people can imagine or recall low-quality images and sounds while awake, and psychedelics such as LSD and DMT can provoke a torrent of high-quality images while the person is awake. Thus, the mind is fully capable of internal dreaming.
For most people, internal dreaming is the rule, and external dreaming is the exception. However, if the mind uses ESP and/or receives communications from other minds, then a given internal dream can incorporate direct perceptions of external objects and/or communicated information from other minds. Thus, even an internal dream can have an external component.
For an external dream, the imagery and sounds of that dream are generated using substantial sensory input—by brain bions that have collectively left the body for a short time. However, the common particles normally observed during an external dream are different than the common particles observed when one is awake. In other words, the common particles observed during an external dream are a different class of common particles than the electrons, quarks, photons, and other elementary particles of physics.
For convenience, call the common particles of physics p-common particles, and call the common particles observed during an external dream d-common particles. These d-common particles do not interact with p-common particles.
Those brain bions that have collectively left the body for a short time, call a mind-piece, because at least some brain bions are necessarily left behind with the body. The sensory input for an external dream comes from the interaction of the roving mind-piece with its surroundings. These surroundings typically include other minds and/or mind-pieces, and d-common particles.
 The various molecules of a cell are more or less stable. Thus, typically, a cell without its bion soon reaches a stable state where chemical reactions cease, and the structure of the cell just before that bion’s departure remains mostly unchanged—succumbing only slowly to environmental stresses from outside the cell. This quasi-stability means that a bion can leave its cell for at least a short time, and, upon return, find its cell in much the same state as when it left it (in effect, a bion also “leaves” its cell each time it sleeps—see section 9.3—and this periodic sleeping of a cell’s bion has probably been a contributing factor in the evolution of the cell’s stability).
However, because there is so much interdependency in the human body, subpar performance by cells whose bions are absent—depending on how many bions are absent, for how long, and from which cells—could have a cascading effect that ultimately causes sickness or possibly even death. It seems that to avoid these dangers, the bions are collectively careful about staying with the physical body. For the typical person who has out-of-body experiences, the bions apparently maintain comfortable safety margins for those out-of-body experiences.