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The brain is not inactive during sleep. The electroencephalogram (EEG) tracings here show the patterns of electrical activity during different stages of sleep. Note that the brain waves of an alert person and those of a person in rapid eye movement (REM) sleep (when dreaming occurs) are similar in frequency and amplitude. In non-REM (NREM) sleep, the waves have a higher amplitude and a lower frequency, indicating that neurons in the brain are firing more slowly and in a synchronized fashion.
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