The first waking thought is one of recognition that God had honored the trust placed in Him, even as his last thought on going to sleep had been one of complete confidence. The psalmist is strengthened to meet the needs of the day. The last thoughts of the night are often the first thoughts of the day. Note the sudden dramatic change from depression to triumph. Such is the benediction of the night and the promise of the new day (see Lam. 3:22, 23).
I laid me down.
The pronoun “I” is emphatic. David represents himself as in danger of attack at any moment during the night, hunted and cursed by his enemies, nevertheless able to lie down in peace and sleep, so great was his trust in God. Since everything was in God’s hands, he had a sense of complete protection. His sleep was not mere weariness or indolence or presumption; it was an act of faith. Internal calm nerved him for the next day’s fight.