The Sandman (book)

The Sandman is a children's book written by Ralph Fletcher with drawings by Richard Cowdrey. It was first published in 2008 by Henry Holt and Company.
Plot summary.
Tor is an man one inch tall who can not fall asleep no matter what he tries. He finds a dragon scale while walking in the woods. He learns that the powder made by grinding the scale help a person to sleep. He then travels sprinkling the sand into the eyes of children who are having trouble sleeping.