Title: Beggars ride
First published: 1996
Description: From back cover Tor paperback December 1997:

Two hundred years in the future regular human beings hate and fear the Sleepless and the SuperSleepless, genetically modified humans who are immune to disease and hunger, and need no sleep.  When the Sleepless plot to take over the world and leave regular humans powerless, civiliaztion and the very meaning of the word "human" hang in the balance.
Subjects: Genetic engineering, Fiction, Fiction, science fiction, general
LC classification: PS3561.R46 B44 1996