songs in the night!

Any fool can sing in the day. When the cup is full, man draws inspiration from it; when wealth rolls in abundance around him, any man can sing to the praise of a God who gives a plenteous harvest. It is easy to sing when we can read the notes by daylight; but the skillful singer is he who can sing when there is not a ray of light by read by- who sings from his heart, and not from a book that he can see, because he has no means of reading, save from that inward book of his own living spirit, whence notes of gratitude pour out in songs of praise. No man can make a song in the night himself. The Christian gets his songs from God: God gives him inspiration, and teaches him how to sing: "God my Maker, who giveth songs in the night."

So, then, poor Christian, thou needest not to go pumping up thy poor heart to make it glad. Go to thy Maker and ask Him to give thee a song in the night. Thou art a poor dry well: thou hast heard it said, that when a pump is dry, you must pour water down it first of all, and then you will get some up; and so, Christian, when thou art dry, go to God, ask Him to pour some joy down thee, and then thou wilt get some joy up from thine own heart. Do not go to this comforter or that, for you will find them Job's comforters, after all; but go thou first and foremost to thy Maker, for he is the great composer of songs and teacher of music; he it is who can teach thee how to sing: "God, my Maker, who giveth me songs in the night!"

It is not natural to sing in trouble- "Bless the Lord, O my soul, and all that is within me bless his holy name:" for that is a daylight song. But it was a divine song which Habakkuk sang, when in the night he said- "Though the fig-tree shall not blossom…yet will I trust in the Lord."
Songs in the night come only from God; they are not in the power of man because usually in the night of a Christian's experience God is his only song.

(Charles Spurgeon, Song in the Night pg. 171)