Every week, for the 25 hours beginning just before sundown on Friday until after night has fallen on Saturday night, Jewish people celebrate Shabbat, a period of rest and spiritual rejuvenation. Jewish women and girls (or men, when there are no women present) light Shabbat candles 18 minutes before sunset on Friday afternoon and on the eve of Jewish holidays, often in the dining room where the festive holiday meal will soon take place. Single girls and women light one candle, and married women light (at least) two candles.