Psalms 4:8 ESV
“In peace I will both lie down and sleep; for you alone, O Lord, make me dwell in safety.”

David was a man of war, a few times he took matters into his own hands, which never turned out good for him. But God called him, “a man after Mine own heart.” So, David knew how to trust God and come back in close relationship with God..

David said that when he laid down in peace and slept it was because he knew he could trust God to keep him safe. I like that because that is a relationship that will be beneficial to God, He can trust us, and a relationship that is beneficial to us, because we can trust Him. The results, sweet sleep.