Therefore, it says: "Awake, O sleeper, and arise from the dead, and Christ will give you light." (Eph 5:8-14)
https://bible.usccb.org/bible/readings/031923.cfm
The Fourth Sunday of Lent with its rose-colored vestments signals that the celebration of the Paschal Mystery is near. The selection from today’s readings (possibly an early baptismal hymn) calls to mind our being chosen and enlightened by Christ.