I believe Peggy Lee may have been co-writer of the song.

You also left out the second verse:

My mother, she is working, she is working very hard,

But every time she looks for me, I'm sleeping in the yard.

My mother says I'm lazy, and maybe she is right.

I'll go to work mañana, but I gotta sleep tonight.

Mañana, mañana, mañana is soon enough for me.