Lullaby

Lullaby is a recurring ability in the Final Fantasy series. It is often an attack usable with the Sing command, and universally attempts to inflict Sleep on the targets.

Final Fantasy IV
Sing is one of Edward's Bardsongs, and put enemies to sleep. In the DS and iOS releases, the Bardsong Augment allows any party member to use Bardsong and potentially use Lullaby with it.

Final Fantasy IV: The After Years
Lullaby returns as one of the possibly songs usable with Edward's Bardsong, with the same effect.

Final Fantasy VI
Lullaby is an enemy ability that inflicts Sleep on the party. It is used by Still Life, Goddess, Flan Princess, Kaiser Dragon, Chadarnook, and Alluring Rider

Final Fantasy XI
Lullaby is one of the Bard's Songs.

Final Fantasy Mystic Quest
Lullaby is used by the Ninja, and inflicts Sleep on a single target.

Final Fantasy Legend III
Lullaby is an enemy ability that inflicts one enemy with Sleep. It can be used by EvilMask, Thanos, Soarx, and Maitreya.

Final Fantasy Dimensions
Lovely Lullaby is an ability for the Bard class, learned initially. It costs 16 MP and will attempt to inflict Sleep on all enemies in the battle.

Etymology
A is a soothing song, usually sung to young children before they go to sleep, with the intention of speeding that process.