釋氏要覽 3.202

3.202

寶雲經云。欲臥。身向右邊累足。以法衣覆身。正念正知。起明了想。但為長養諸根大種故○瑜伽論問曰。何緣右脇而臥。答與師子王法相似一切獸中。勇捍堅猛。最為第一。苾芻亦爾。發勤精進。勇捍堅猛。最第一。由是因緣。與師子臥法相似。如是臥時。身無掉亂。念無忘失。睡不極重。不見惡夢故。

The Ratnamegha-sūtra states: 'When intending to lie down, place the body on the right side with the feet overlapping, cover the body with the Dharma robe, maintain correct mindfulness and clear comprehension, and generate the notion of illumination, solely for the sake of nourishing the sense faculties and the primary elements.' The Yogācārabhūmi-śāstra asks: 'For what reason does one lie on the right side?' It answers: 'It resembles the manner of the lion king. Among all beasts, its bravery, firm fortitude, and fierceness are supreme. The bhikṣu is also like this: arousing diligent vigor, his bravery, firm fortitude, and fierceness are supreme. Due to this reason, it resembles the lion's manner of lying down. When lying down like this, the body is not agitated or disordered, mindfulness is not lost, sleep is not excessively heavy, and one does not see bad dreams.'