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睡眠，是自然恢复的心智和身体状态，其特征是意识改变，相对抑制的感觉活动，肌肉活动减少以及快速動眼睡眠几乎所有骨骼肌受到抑制，以及与周围环境的互动减少。睡眠与清醒的区别在于对刺激做出反应的能力降低，但...