Translations:Scheduling overview/5/zh-hans

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NREM第二阶段是比第一阶段更深的睡眠,占总睡眠的45至55%。与NREM1相比,在NREM2中更难被唤醒。这个阶段的特征是K-复合波睡眠梭状波,即Alpha波活动的突然中断。这阶段的睡眠也负责维持长时间的清醒状态。