I went to The Red Hot Jazz Archive to hear Ma Rainey singing SLEEP TALKIN' BLUES, and they're supposed to have it, but what I heard there sounds like a totally different song. I suspect the Archive got something mislabeled.

I did find out, though, that the lyrics to SLEEP TALKIN' BLUES might be in the book Blues Legacies and Black Feminism: Gertrude "Ma" Rainey, Bessie Smith and Billie Holiday by Angela Yvonne Davis (New York: Vintage, 1999). WorldCat.org might help you find it in a library.

Yes, I think it's that Angela Davis. It might be a good read.