Susan looked at him admiringly. “Goes on without the sleep. Genetic adjustments tie it to other changes in the pineal gland.”

“What about the—”

“The side effects?” Mrs. Camden said. Her mouth turned down. “What about the bloody side effects?”

Susan turned to Elizabeth Camden. She had forgotten she was there. The younger woman stared at Susan, mouth turned down at the corners.

“I’m glad you asked that, Mrs. Camden. Because there are side effects.” Susan paused; she was enjoying herself. “Compared to their age mates, the nonsleep children — who have not had IQ genetic manipulation — are more intelligent, better at problem-solving, and more joyous.”

Camden took out a cigarette. The archaic, filthy habit surprised Susan. Then she saw that it was deliberate: Roger Camden was drawing attention to an ostentatious display to draw attention away from what he was feeling. His cigarette lighter was gold, monogrammed, innocently gaudy.

“Let me explain,” Susan said. “REM sleep bombards the cerebral cortex with random neural firings from the brain stem; dreaming occurs because the poor besieged cortex tries so hard to make sense of the activated images and memories. It spends a lot of energy doing that. Without that energy expenditure, nonsleep cerebrums save the wear-and-tear and do better at coordinating real-life input. Thus, greater intelligence and problem-solving.

“Also, doctors have known for sixty years that antidepressants, which lift the mood of depressed patients, also suppress REM sleep entirely. What they have proved in the past ten years is that the reverse is equally true: suppress REM sleep and people don’t get depressed. The nonsleep kids are cheerful, outgoing… joyous. There’s no other word for it.”

“At what cost?” Mrs. Camden said. She held her neck rigid, but the corners of her jaw worked.