On verses by Friedrich Wilhelm Gotter.
For many years it was believed that the song was written by V.A. Mozart and was listed in Koechel`s catalog as KV 350.
For some time now, Bernhard Flies has been considered the author of the melody. According to another version, the author is Friedrich Fleishman.
https://en.wikipedia.org/wiki/Schlafe,_mein_Prinzchen,_schlaf_ein
https://en.wikipedia.org/wiki/Bernhard_Flies
https://en.wikipedia.org/wiki/Friedrich_Fleischmann
Other performances of the song: http://classic-online.ru/ru/production/28738