Kiernan Shipka is no stranger to a midday nap, especially when she’s traveling. When the 24-year-old actress calls me on Thursday, it’s 6 p.m. in Paris and she has just woken up.

For Kiernan Shipka, her character, one of many memorable roles in the cast of "Mad Men," underwent a major life change before the actor did in real life. Shipka told Cosmopolitan that while ...