Wikipedia says that the poem Wynken, Blunken, and Nod was written by American poet Eugene Field in 1889, and its original title was "Dutch Lullaby." There was a musical setting written in 1890, but that setting is long forgotten. Lucy Simon wrote a new setting, and The Big 3 (with Cass Elliot) released the song on their self-titled album in 1963. The Simon Sisters recorded the song in 1964 on Meet the Simon Sisters.

Here's another recording of the song by the Simon Sisters:

https://www.youtube.com/watch?v=ZgmKcbLJVxg

Carly's alto is dominant in this recording - I like it, but it may have been this recording that made it hard for me to learn the melody at the end of each verse.

-Joe-