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The Brain: Teaching Modules

Sleep and Circadian Rhythms

This module covers our natural rhythms and the stages that occur during sleep. It shows the brain's electrical activity over the course of a normal night's sleep, with its REM and non-REM cycles. The remainder of the module is devoted to an experiment conducted by Michel Siffre, a French cave explorer, in which Siffre spends seven months in a Texas cave. Without external cues, the body is shown to have its own built-in clock.

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