How To Sleep (cartoon sequence)

In this 1935 live-cartoon short made by MGM and starring Robert Benchley we have two cartoon sequences:

There are two segments in the film:
1) A visual demonstration of blood flow in the brain on an animated man located in the beginning of the picture.
2) The counting sheep section located around four minutes in of the film.

There's no information about who done the animation. I guess it's not Harman-Ising.

Trivia:
*Academy Award winner (Best Short Subject)