The Spanish shopping siesta may be about to become the latest victim of the sovereign debt crisis. To stimulate spending after a 23 percent drop in retail sales since 2007, the euro region’s fourth-largest economy this month approved measures that allow shops of more than 300 square meters (3,229 square feet) to open for 25 percent longer a week. The new rules may encourage the outlets to sell during the traditional afternoon snooze from 2 p.m. to 4 p.m., and on an additional two Sundays or holidays a year for a total of 10. “When everything was fine, nobody complained, but now that things have gone awry, then it’s another story,” said Carmen Cardeno, director general for domestic commerce at the nation’s economy ministry, which created the rules. “We need to evolve and be more flexible.”...