The Four Stages Of Sleep (REM) Rapid Eye Movement

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According to (Carpenter & Huffman, 2012, p. 121), there are four stages of sleep; the first four are called non-REM state then the last and final state is called REM )Rapid Eye Movement). When the sleep cycle starts it lasts an average of 1-2 hours; the first sleep cycle has relatively short REM sleep followed by a long period of deep sleep. Later in the sleep cycle REM period lengthen and deep sleep time decreases. Even though cats tend to sleep longer than human its shows that they have slept similar patterns as humans, including sleep phases of REM stage. When human enter REM stage, breathing becomes more rapid, irregular and shallow; the eyes start to move rapidly back and forth. In this stage, the limb muscles become temporarily paralyzed.
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