Psalm 4 is an evening prayer. Like all poetry, it is emotion recollected in tranquility. As David prepares to lay down and go to sleep, he ponders the day’s events. As he takes stock of his situation, he prays for God to defend him, he prays for his enemies, he prays for his companions, and he trusts God to protect him through the night. His enemies may spend the night hunting him down, but David will not panic. He knows that the One who watches over Israel neither slumbers nor sleeps.