Dreams area unit unconscious experiences that involve vision, hearing, thoughts, feelings, or alternative senses in sleep, particularly throughout sleep amid speedy eye movement (REM sleep).
Events in dreams area unit typically not possible within the world, and on the far side the ability of the dreamer. The exception is within the dream that's known as lucid dreaming. In such dreams, the dreamer realizes that he's dreaming once the dream remains ongoing, and is typically able to modification the atmosphere in his dreams and management some aspects of the dream.
Dreamers may feel emotions once dreaming, for instance emotions worry during a nightmare. a topic that studies concerning dreams is named oneirologi.
Dreams occur at the stage of the speed of eye movement once sleeping, wherever brassierein activity is high and as if during a state of arousal. The length of the dream varies, a minimum of many seconds, or concerning 20-30 minutes. Opinions concerning the which means of dreams vary supported time and culture. Most fans of Freud's theory agree that the which means of vision in dreams is that the look of hidden wishes and emotions. many alternative theories show that dreams area unit a stage of memory formation, downside finding, or just S128 product from brain activation.