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Stage three sleep as well as stage four is usually referred to as a slow wave sleep. Which basically mean a slow frequency of brain thought. There are no visible eye movements in this stage (Carskadon 10). Again in stage three it takes even more arousal then stage two sleep, to awaken a person from this state of sleep. Most of the dreams remembered occur during stage three sleep (Carskadon 11-12).
Stage four sleep is the deepest of sleep. This is where the body and mind gets the most rest. Brain frequencies increase slightly in stage four sleep. In this stage of sleep people begin their dreams. When a person is dreaming you can visually tell by the movement of the eyes. Scientist and theorist measure deep sleep by "R.E.M." which simply means "rapid eye movement". R.E.M. is measured by sleep monitoring instruments. What they measure is the amount of time your eye moves in stage four sleep and also brain activity along with frequency. Once again much more arousal is needed to awaken a stage four sleeper (Carskadon 14-19).
Next we need to examine dreams and the different types of dreams. According to Dr. Koch-Sheras the definition of a dream is " a story that evolves in your mind, all in a single flash" (32). Dr. Koch- Sheras also states that a dream is " a sequence of sensations, images and thoughts" (32). I discovered through recent self research I that a lot of people don't remember their dreams or that they just don't dream at all. Well the myth that not everyone dreams is false. Everyone dreams. Everyone! (Koch-Sheras 41). Within a year some people may only remember few or no dreams but, they still dream. Some people are just able to recall dreams better than others (Koch-Sheras 42-46). Dr. Medard Boss professor of psychotherapy at the University of Zurich says that " People with above average I.Q. and or upper brain function are more apt to recall dreams of the past nights sleep and sometimes of dreams in past days, weeks, months and possibly years in certain past cases" (192).