nd Cartwright, a dream expert, separates the significance of dreams into four categories. According to Cartwright, dreams serve to review, revise, rehearse, and repair ourselves. To fully grasp the importance of these four R's and the understanding of dreams, researchers must first study sleep patterns.
             In order to study the stages of sleep, patients are tested with a device called an electroencephalograph (Myers 210). This machine measures brain wave activity, eye movements, and muscle tension through electrodes. Other similar devices are used to record heart rates, respiration
             rates, and the degree of genital arousal during sleep. After collecting all of this data, researchers are able to analyze patients' dreams.
             According to David G. Myers, a professor of psychology at Michigan's Hope College, there are four stages associated with sleep prior to Rapid Eye Movement, REM sleep. In Stage 1, breathing rate slows and brain waves slow down even further. During this light sleep, fantastic images similar to hallucinations are experienced. Sensations such as falling or floating are usually felt during this two- minute stage.
             Soon after Stage 1, a greater sense of relaxation settles in. This is the beginning of Stage 2. This stage, lasting about twenty minutes, is characterized by bursts of rapid brain-wave activity. Because of this sudden surge of brain waves, sleep talking becomes prevalent.
             Stage 3 and 4 are often linked together because of their similarities. They last for about thirty minutes and are called slow-wave sleep because of the slow delta waves the brain emits during these stages. Delta waves have a frequency of 3.5 cycles per second, which makes them much slower than the beta wave of fifteen cycles per second. Because of these slow delta waves, it is especially
             difficult to wake the sleeping person from the third and fourth stages of sleep. Children may also wet the bed or begin sleepwalking at these sta...