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Sleep cycle is a recurring pattern of physiological and neurological changes that occur during sleep, consisting of two main types: Non-Rapid Eye Movement (NREM) sleep and Rapid Eye Movement (REM) sleep. NREM sleep is further divided into three stages: N1, N2, and N3. N1 is the lightest stage of sleep, lasting a _______ _______ ________ ______ ____ _____ _______ _____ ____ _________.
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