The movie is called Shadow Play and comes out in 2010. Below is a description of the movie from IMDB:

Shadow Play depicts the story of the of Cole Hindin, an overworked and over-medicated cleaning service employee. He finds himself faced with the daunting task of single-handedly servicing a sprawling mansion over the course of a single night. He is plagued by horrific hallucinations, a culmination of many events. He witnessed a gruesome murder-suicide a year earlier, is badly bruised by memories of a failed marriage and strung out on a cocktail of prescription medication. With not nearly enough sleep, Cole struggles to maintain his sanity throughout the night while dealing with Henry, the deranged home owner.

Sounds, Interesting, don’t really know if it looks good or not. Maybe more will be explained in future trailers.

Thanks for the trailer link Alice!!