Once, there was a little unicorn filly who was scared of many things. Almost every night, she found herself unable to sleep and could only be comforted by the singing of a certain lullaby. Years later, long after Rarity left home to pursue a career, Sweetie Belle tries to find a way to reconnect with her older sister, but that's proving to be more difficult than Sweetie expected. A tie-in with Ambition.