Awake up, my glory; i.e. "my soul" (comp. Psalms 16:9; Psalms 30:12). The psalmist stirs his soul to earnest, heartfelt devotion. Awake, psaltery and harp; i.e. awake, my musical instruments and my musical powers, which have slept, as it were, while I was in affliction.
I myself will awake early; or, "will awaken the dawn" (comp. Ovid, 'Metaph.,' 11.597, "Vigil ales evocat auroram;" and Milton, "Cheerly rouse the slumbering morn."