She could see that his eyes were clear, unclouded by either drink or sleep.

"There's a little kid who plays with matches," the man said, his voice blurred by sleep.

No wonder we cling to so many fallacies about how to get by on little sleep.

He had the look of someone felled by sleep, and just wakened.

That look was gone now, washed away by sleep or by acceptance.

He told himself he had his morning mind again, all rinsed by sleep, fresh as sea air.

"The unconscious monitoring system, while suppressed by sleep, is still available to keep us from falling out of bed," he continued.

Characters have an energy level, restored by sleep, rest, fluids or injections.

Jenny's voice was clearer, the thickness caused by sleep quickly disappearing.

His hair was the deep brown of oak bark, and though unkempt by sleep, it created a good frame for a strong face.