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A dream is the experience of envisioned images, sounds, or other sensations during sleep. It occurs in humans, most mammals, and some birds.  The events of dreams are often impossible or unlikely to occur in physical reality, and are usually outside the control of the dreamer. The exception is lucid dreaming, in which dreamers realize that they are dreaming, and are sometimes capable of changing their oneiric reality and controlling various aspects of the dream, in which the suspension of disbelief is often broken. Dreamers may experience strong emotions while dreaming. Frightening or upsetting dreams are referred to as nightmares... wikipedia.org
Dreaming is a universal phenomenon. ....A quarter century of research has shown that dreams are communication from the inner levels of man’s consciousness to his outer, waking mind. All dreams including flying dreams, nightmares, and recurring dreams hold significance for the dreamer. The meaning of daily experiences is communicated through dream images to the conscious awareness of the dreamer providing feedback concerning his or her spiritual, mental, emotional, and physical state of being. Understanding and fully using the dream state can resolve problems, enhance creativity, and accelerate learning. Visit DreamSchool.org to learn more about dreams and their meanings.