Stock indexes sleepwalked in tiny moves up and down late Thursday morning, as volume dwindled in typical Christmas Eve trade. The Nasdaq added about 0.1%, while the S&P 500 lost 0.1%. The Dow Jones industrial average sanded off 0.2%. Volume in the stock market today was sharply off the previous session’s pace. Gold mining stocks led the upside, while apparel groups were looking frayed. Blue chips were mostly down.