On a typical Friday night in Houston, many young people are out drinking at bars or curled up watching Netflix, grateful to be done with the obligations of the workweek. But in a few Houston homes, Jews in their 20s and 30s have opted to fill these evenings with a different kind of obligation: strictly observing Shabbat, or the Jewish Sabbath. This means no texting, no music, no use of electronics, no driving, no meeting last-minute deadlines, no carrying objects outside of a few hundred square yards. It is a choice to embrace ritual over leisure, a sacrifice of freedom in behavior, diet, and dress for an ancient set of rules.