Listen to When It's Sleepy Time Down South online. When It's Sleepy Time Down South is an English language song and is sung by Duke Ellington. When It's Sleepy Time Down South, from the album Duke Ellington: Will the Big Band Ever Come Back+Recollections of the Big Band Era, was released in the year 2016. The duration of the song is 3:18. Download English songs online from JioSaavn.