Originally an orchestral work, Järnefelt's Berceuse is highly effective in its piano transcription. It is famous for its hypnotic, lullaby-like rhythm and its shimmering, lush melodic landscape.
The main challenge is maintaining a continuous, fluid legato across the accompaniment figures.
Comparable difficulty and character — good candidates for what to learn next.
Berceuse - Cradle Song is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Berceuse - Cradle Song lasts about 4 minutes.
Berceuse - Cradle Song 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 Berceuse by Armas Järnefelt, Clair de lune by Claude Debussy, Berceuse by Gabriel Fauré — see the full similar-pieces list on this page.