大比丘三千威儀 1.45

1.45

臥有五事：一者當頭首向佛、二者不得臥視佛、三者不得雙申兩足、四者不得向壁臥亦不得伏臥、五者不得竪兩膝更上下足。要當枕手、撿兩足、累兩膝。

In lying down, there are five matters: first, the head should face toward the Buddha; second, one must not lie down facing the Buddha directly while looking at him; third, one must not stretch out both feet together; fourth, one must neither lie facing the wall nor lie face down; fifth, one must not set both knees upright, alternately raising and lowering the feet. As a rule, one should pillow the hand, draw in both feet, and stack the two knees.