Ryan Gassett had already put in a full day, moving heavy boxes and furniture for $15 an hour, when his introductory welding class began at 10 p.m. By the time he arrived at Lone Star College north of Houston, the highway toll collectors at the exit for the school had closed for the night and the campus janitors were mopping bathrooms.
The graveyard-shift course was not his first choice, Mr. Gassett, 19, explained, but “there were no other openings.” So he took what he could get.