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Psychological DisordersPsychological DisordersEssentials of Understanding PsychologyEverest University OnlineSondra SilverbergProf. PerezJuly 6, 2012This chapter contains information on the four stages of sleep. Stage one, transition between sleep. Stage Two, deeper sleep and stage three, a deeper sleep, which has lower brain waves than stage two. Stage four, is the deepest sleep, during which we are least.