My mother sang this song to me when I was growing up. I can remember her coming in and sitting on the bed if I was restless and singing this song. It was only later when I began singing it to my children that I wondered about it. I found out it was a song her mother sang to her.
When my grandmother was dying we gathered around her hospital bed and visited and chatted. She had pneumonia but was in good spirits. We talked about many things. Questions were answered and one that I asked her, if she remembered this song. I had made up a line for it because I didn't remember it exactly.
She remembered it word for word. She was 90 years old, the day before she died and she sang it to all of us for the last time.
The song was published in 1926
just two years before my mother was born. She was the last baby in the family
so I wish I had asked about other "lullabies" that she sang.
Here is the link