After four years off and two kids, Aleisha Cline is seizing the Olympic opportunity. Tackling sleep deprivation by night and Olympic training by day, Aleisha Cline is probably the world’s fastest mom on skis. Cline, 39, came out of retirement last year to try for the 2010 Olympics and finds competing overseas with the national ski cross team is “almost a holiday” compared to parenting a preschooler and toddler who tends to wake for milk at 4 a.m.