Coke’s recent “Sleepwalker” ad had a whimsical, humorous tone. In contrast, the new movie “In My Sleep” examines the darker side of sleepwalking.The movie’s tagline is, “Sleepwalking can be deadly.” And the film is rated PG-13 for sexual content, violence and bloody images.The plot was inspired by real sleepwalking stories, first-time director Allen Wolf said in a press kit. He also wrote and