On the other hand, especially in winter, the office of matins takes place when night is still total and all nature is asleep, for the monk must rise in darkness and pray at length in darkness, waiting for day and illuminating the shadows with the flame of devotion. Therefore, custom wisely provided for some wakers, who were not to go to bed when their brothers did, but would spend the night reciting in cadence the exact number of psalms that would allow them to measure the time passed, so that, at the conclusion of the hours of sleep granted the others, they would give the signal to wake.
