This sounds like a burglar alarm commercial: "He who keeps Israel will neither slumber nor sleep" (Psalm 121:4). Indeed, God gives us 24-hour protection.
Holding fast to this promise, Psalm 27 boldly says, "The Lord is my light and my salvation; whom shall I fear? The Lord is the stronghold of my life; of whom shall I be afraid?"
We trust this promise: "God will keep your life. The Lord will keep your going out and your coming in from this time on and forevermore" (Psalm 121:8). So we can say with Jesus, whether in life or death: "Father into your hands I commend my spirit."
Indeed, this is a continuing blessing. And like the psalmist, we can daily pray the following from the "Night Prayer (Compline)" liturgy.
Guide us waking, O Lord, and guard us sleeping;
that awake, we may watch with Christ and asleep, we may rest in peace. Amen.