The 1934 Marion Davies-Gary Cooper vehicle “Operator 13” was a Civil War spy drama that featured a number of Walter Donaldson-Gus Kahn songs. The Mills Brothers were on hand to perform a couple of them, including their popular recording of “Sleepy Head” (Mills version here: https://youtu.be/y3K6DTUZkFI ).
From 78rpm Bluebird B-5524 - Sleepy Head (Donalson-Kahn) by Vincent Lopez and his St. Regis Hotel Orchestra, vocal by Frances Hunt, recorded in NYC May 31, 1934