I hate to say the obvious but, if there were lights on in the room, there would be no shadows at all. If it is a shadow person, he is blocking part of a doorway. The light that is entering the room from the window is from the outside. I believe the exposure was about 6 seconds long.
We're going back there May 20th with a group Badgegirl007 put together. I try to get a picture of the room with the lights on. However, I have no control over the lighting. When its lights out... the only thing you have is a flashlight.