The Rule of St. Benedict - Chapter 8. The Divine Office At Night

(1) During the winter season, that is, from the fist of November until Easter, it seems reasonable to arise at the eighth hour of the night.
(2) By sleeping until a little past the middle of the night, the brothers can arise with their food fully digested.
(3) In the time remaining after Vigils, those who need to learn some of the Psalter or readings should study them.

(4) Between Easter and the first of November mentioned above, the time for Vigils should be adjusted so that a very short interval after Vigils will give the monks opportunity to care for nature’s needs. Then at daybreak, Lauds should follow immediately.

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