Ah," Gary said dreamily. " 'Free time.' I've heard about that. Don't fool yourself, Fire-Top. What with extra hours of lessons for punishments, the extra work you get every day, free time is an illusion. It's what you get when you die and the gods reward you for a life spent working from dawn until midnight. We all face up to it sooner or later--the only free time you get here is what my honored sire chooses to give you, when he thinks you have earned it." "And he doesn't give it to you at night," Alex put in. "He gives it to you when you've been here awhile, on Market Day and sometimes a morning or afternoon all to yourself. But never at night. At night you study. During the day you study. In your sleep--