To be able to sleep at night, with a peace and a sense that everything is alright, comes from a renewed mind concerning what Christ’s sacrifice produced. Because he took our sin upon himself, now we can walk free from the weight of sin. We have power over sin now, and we can walk joyfully with the Father hand in hand.
Hebrews 9:14
14 How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?
King James Version (KJV)