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The dream is a form of involuntary images containing unconscious material and unconscious expression, consisting of a sequence of images, sounds, ideas, emotions and other sensations that usually occur during sleep, but especially in the case of sleep in which eyes move (paradoxical sleep / REM - "rapid eye movement"). Cognitive capacities, such as thinking and memory, are secondary, the person who sleeps psychologically and emotionally sees the events in the dream as real elements. There is a branch of psychology that deals with the study of sleep dreams. It has been noted that a human lives and dreams on average for about six years (which corresponds to an average of 2 hours per night). It has not yet been discovered which part of the brain generates dreams, whether there is only one area of ​​the brain that generates them, whether there is more involved, or what really is the purpose of dreams. During REM sleep (paradoxically), the release of certain neurotransmitters is completely suppressed. As a result, motor neurons are not stimulated, a condition known as nerve relaxation. This relaxation suppresses the uncontrolled movement of the body during sleep and, often with nightmares, the feeling of paralysis, helplessness occurs.