修習止觀坐禪法要 1.60

1.60

二、調睡眠者：夫眠是無明惑覆，不可縱之。若其眠寐過多，非唯廢修聖法，亦復喪失功夫，而能令心闇昧，善根沈沒。當覺悟無常，調伏睡眠，令神氣清白，念心明淨，如是乃可棲心聖境，三昧現前。故經云：「初夜後夜，亦勿有廢。無以睡眠因緣，令一生空過，無所得也。當念無常之火，燒諸世間，早求自度，勿睡眠也。」

Second, harmonizing sleep: sleep is an obscuration of ignorance; one must not indulge it. If one sleeps excessively, not only does it abandon the cultivation of the noble Dharma and forfeit effort, but it also renders the mind dark and dull, causing wholesome roots to sink and vanish. One must awaken to impermanence and tame sleep, keeping the vital energy clear and pure and the mindful consciousness bright and clean. Only in this way can one rest the mind in the noble realm and have samādhi appear before one. Thus a sūtra says: 'During the first and last watches of the night, do not neglect [practice]. Do not let a whole life pass in vain with nothing attained on account of sleep. Be mindful of the fire of impermanence burning all worlds; seek your own deliverance early, and do not sleep.'