Soa como Mendigos na Espanha por Nancy Kress. De Wikipedia :
Beggars in Spain (and its sequels) take place in a future where genetic engineering has become a reality, and faces the consequences of genetic modifications (genemods) on society and culture.Sleeplessness confers a number of secondary benefits—higher IQ and a sunnier disposition most notably, as well as 1/3 more productive time (vs the time the unmodified spend asleep); Sleepless not only don't need sleep, they cannot sleep