tap the lights, sing them to sleep
In an old apartment building, someone is always awake.
Up on the roof lives a parrot who has learned every song that drifts through the thin walls. Every night it sings a neighbor's lullaby and puts them to sleep, one lit window at a time. It just doesn't have a lullaby of its own.
A window lights up when a neighbor is tossing and turning. Tap it, and the song reaches them. Nothing to memorize, nothing to count. The lullaby plays by itself — piano, cello and strings — and each window lights up just before its note, so the music tells you when to look.