The Rule of St. Benedict

Let the brethren sleep singly, each in a separate bed. Let them receive the bedding befitting their mode of life, according to the direction of their Abbot. If it can be done, let all sleep in one apartment; but if the number doth not allow it, let them sleep in tens or twenties with the seniors who have charge of them. Let a light be kept burning constantly in the cell till morning.

Let them sleep clothed and girded with cinctures or cords, that they may be always ready; but let them not have knives at their sides whilst they sleep, lest perchance the sleeping be wounded in their dreams; and the sign having been given, rising without delay, let them hasten to outstrip each other to the Work of God, yet with all gravity and decorum. Let the younger brethren not have their beds beside each other, but intermingled with the older ones; and rising to the Work of God, let them gently encourage one another on account of the excuses of the drowsy.