"Schlafe, mein Prinzchen, schlaf ein" ("Sleep, my little prince, fall asleep") is a German lullaby dating from the 18th century. Mostly it was used as a German Christmas song, around the holiday and it was mostly sung by young choirs.
The words are by Friedrich Wilhelm Gotter. For many years, the common view was that the melody was composed by Wolfgang Amadeus Mozart and it was entered into the Köchel catalogue as K. 350. Attribution for the melody has since shifted to either Bernhard Flies or Friedrich Fleischmann, and it has been removed from the main body of the Köchel catalogue and put into the appendix for spurious or doubtful works as K. Anh. C 8.48.
Setting from .