WASHINGTON -- Lawmakers trying to craft an energy bill started with the issues they thought wouldn't generate much heat. But then they tried to tinker with Americans' clocks, by extending daylight-saving time by two months. Proponents figure extra daylight in the evenings will help the nation save electricity. But juggling Americans' biorhythms, lawmakers learned, transcends the energy policy debate. Critics started complaining loudly about children walking to school in the dark, airlines struggling to schedule flights overseas and technicians scrambling to recalibrate computers. House and Senate negotiators, trying to sort out their differences and craft a comprehensive energy bill before...