Singing Mockingbird at Night

Two nights ago I heard a Mockingbird singing his heart at night, about 1 A.M, while I was putting peanuts out in the birdfeeder before going to bed. It was really something to hear this particular bird singing at this hour, because it has sooo many sounds and songs it makes, mimicking different birds and sounds, and also to hear it with no other sound interference, like other birds or other noises that are more present in the day. So I looked it up and read that only unmated male mockingbirds sing at night. Well, I hope he finds a mate this spring...