Charles H. Spurgeon on Psalms 3:5

David's faith enabled him to lie down; anxiety would certainly have kept him on tiptoe, watching for an enemy. Yea, he was able to sleep, to sleep in the midst of trouble, surrounded by foes. "So he giveth his beloved sleep." There is a sleep of presumption; God deliver us from it! There is a sleep of holy confidence; God help us so to close our eyes! But David says he awaked also. Some sleep the sleep of death; but he, though exposed to many enemies, reclined his head on the bosom of his God, slept happily beneath the wing of Providence in sweet security, and then awoke in safety. "For the Lord sustained me." The sweet influence of the Pleiades of promise shone upon the sleeper, and he awoke conscious that the Lord had preserved him. An excellent divine has well remarked —"This quietude of a man's heart by faith in God, is a higher sort of work than the natural resolution of manly courage, for it is the gracious operation of God's Holy Spirit upholding a man above nature, and therefore the Lord must have all the glory of it."