Bonne nuit is a sentimental salon piece characteristic of late 19th-century amateur repertoire. It features a simple, song-like melody supported by broken-chord accompaniment typical of Hitz's didactic style.
The primary challenge is maintaining a singing tone in the right hand while balancing the accompaniment beneath.
Comparable difficulty and character — good candidates for what to learn next.
Bonne nuit (Op.200) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Bonne nuit (Op.200) lasts about 3 minutes.
Bonne nuit (Op.200) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Ballet des ondines by Franz Hitz, C'était un rêve by Franz Hitz, Barcarolle by Franz Hitz — see the full similar-pieces list on this page.