Robb plays a young girl who has to come to terms with the fact that her mother (Theron) has abandoned her, and that she has been left with her uncle James (Stahl), who is not ready to deal with raising a kid on his own. Hopper plays the patriarch of this dysfunctional family and by the looks of the trailer, he is making full use of his skill with playing a 'villain.'
Sleepwalking was written by Zac Stanford, who is a relative newcomer, and this was his first feature film script. Bill Maher (no, not that one) directed the dysfunctional weepie, and is also relatively new to the directing game. (So far, Maher has spent most of his career as a visual effects artist on films like X-Men and Mars Attacks!) The movie was chosen to be a part of the Sundance slate (you can check out stills from the film from our Sundance coverage here), but there is no word about a release date. One look at the credits would lead me to believe that it probably won't take long before the property is snatched up by a studio.