Dreaming is a one of the mental activity that is different from waking thoughts, which occurs during sleep. Different clinical and Laboratory studies have characterized the nature of dream. These studies show that dreams are more perceptual than conceptual: and the things in the dreams are seen, felt and heard than being subjected to thought. Almost in all dreams in the terms of the senses, visual experience is present; auditory experience in 40 to 50 per cent; and touch, taste, smell, and pain in a relatively small percentage. Dream also present considerable amount of feelings and emotions—usually includes fear, anger,fun or ultiamte joy also with the emotions and the feelings generally occur in the day too. Most dreams are in the form of interrupted stories, made up partly of memories, with frequent shifts of scene. The physiological characterization of dream includes a great variety of dreams that are experienced. Most of the dreams are rather ordinary, but most some of them have at least some unusual grotesquely strange dreams.