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当昼即寝,即寝即起,入夜复寝。一昼夜间,寝兴分而二之。盖老年气弱,运动久则气道涩,故寝以节
When the day goes to bed, that is, the beginning of sleep, sleep at night. A day and night, sleep Xing points and two. Cover old and weak, exercise for a long time astringent airways, so sleep to festival