Seeking a 1940s or 1950s children’s picture book. I believe the illustrations were somewhat colored and others were only line drawings of color.
The story tells about all the different jobs that people do during the night while we sleep, such as the mail trucks, milk trucks, or trains that deliver things. Bakeries, maybe?
It was a treasured book at my great-grandmother’s house for my father when he was little, and then I read it over and over when I was little. Sadly, it was either sold or taken by his aunt when the estate was settled.