四分律刪繁補闕行事鈔 3.242

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十二常坐不臥者。《薩婆多》云：加趺坐者，將正心故。然始正身，異外道故，生人信心；故三乘人，皆以此坐悟道。《解脫道論》云：夜常不臥也。如《決定王經》中有四法：一乃至彈指頃，於眾生中，不生瞋心。二不應與一時頃，使睡眠覆心。三引導眾生，使得阿練若功德。四晝夜不離念佛。餘如論說。《十住論》說十利：一不貪身樂。二不貪睡眠樂。三不貪臥具樂。四無臥時脇著席苦。五不隨身欲。六易得坐禪。七易讀誦經。八少睡眠。九身輕易起。十求坐臥具衣服心薄。《四分》中：蘭若比丘，敷好臥具安眠。佛言：不應爾！應初夜後夜，警意思惟。所為出家，為存出要，觀行法如後說。《智論》云：身四威儀，坐為第一；食易消化，氣息調和。求道者大事未辨，煩惱賊常伺其便，不宜安臥。若欲睡時，脇不著席。

Twelfth, always sitting and never lying down. The Sarvāstivāda states: 'Sitting cross-legged is for making the mind upright. Then, once the body is straightened, because it differs from the tīrthikas, it inspires faith in people; thus people of the three vehicles all attain awakening through this posture.' The Vimuttimagga states: 'One never lies down at night.' As stated in the Viniscaya-rāja Sūtra, there are four dharmas: 'First, even for the snap of a finger, one does not give rise to anger toward sentient beings. Second, one should not allow sleep to cover the mind even for a single moment. Third, one guides sentient beings so that they obtain the merit of an āraṇyaka. Fourth, day and night one never parts from mindfulness of the Buddha.' The rest is as stated in the treatise. The Daśabhūmika-vibhāṣā states ten benefits: 'First, not craving bodily pleasure. Second, not craving the pleasure of sleep. Third, not craving the pleasure of bedding. Fourth, being free from the pain of having one's ribs touch the mat when lying down. Fifth, not following bodily desires. Sixth, easily attaining seated meditation. Seventh, easily reciting the sūtras. Eighth, having little sleep. Ninth, the body being light and easily raised. Tenth, having little desire to seek bedding and clothing.' In the Dharmaguptaka Vinaya, an āraṇyaka bhikṣu spread out fine bedding and slept comfortably. The Buddha said: 'You should not do so! In the initial watch and the final watch of the night, you should stay alert in mind and contemplate. The purpose of going forth is to preserve the essential means of liberation.' The methods of contemplation and practice are as explained later. The Mahāprajñāpāramitopadeśa states: 'Among the four bodily īryāpathas, sitting is foremost; food is easily digested and the breath is harmonized. For a seeker of the Way whose great matter is not yet accomplished, the thieves of defilement constantly look for an opening, so it is improper to lie down comfortably. If one wishes to sleep, one's ribs must not touch the mat.'