If we are to sleep, we must let go of the past day. We must surrender our control over it and hand everything over to God. Pope John XXIII jokingly recounted how he would pray each evening: "The pope must go to bed, so now you have to take care of the church for a few hours, God." (…) We must rid ourselves of the worries and fears of that day. When a person wakes up at three in the morning, as often happens to me, and worries about what awaits them, they must cast it all upon the Lord and accept his gift of sleep. When the storm raged and the disciples panicked, Jesus slept in the boat.
(Timothy Radcliffe OP /*1945/, Being Alive in God)