Tradition
St. Augustine
The Enarrations, or Expositions, on the Psalms
Psalm 130 › Section 6
6. Since He then rose with the morning watch, our soul began to hope from hence: and how far? “Even unto night;” until we die; for all our carnal death is as it were sleep....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)