Nancy Kress Book Set (x2)

The 1st book is Beggars In Spain. In this future, some people need no sleep at all. Leisha Camden was genetically modified at birth to require no sleep, and her normal twin Alice is the control. Problems and envy between the sisters mirror those in the larger world, as society struggles to adjust to a growing pool of people who not only have 30 percent more time to work and study than normal humans, but are also highly intelligent and in perfect health.
The 2nd book is Beggars And Choosers. Millions of ordinary people are supported by the efforts of the handsome and intellectually superior gene-modified, who are in turn running scared in the face of the astonishing, nearly superhuman powers of the Sleepless, who have their own agenda for humanity. The Sleepless, radically altered humans, have withdrawn from the rest of the race to an island retreat, from which they periodically release dazzling scientific advances. Most of the world is on the verge of collapse.