Engelbert Humperdinck (1854-1921) used this German folk song in the sandman scene in the second act of his opera “Hansel and Gretel”. This is probably the reason why the Japanese lyrics are about a little man that is sprinkling sand in the eyes to make someone sleepy. The melody has been used as the commercial melody for a music school chain for years. This school was founded several decades ago, and numerous students received their education there. Therefore, many people know this melody, mostly, however, without being aware that it is a German folk song.