They make these wonderful devices called 'curtains,' nowadays. Marvel of modern engineering. The gist of it is that a piece of cloth can be drawn - either horizontally OR vertically - across any transparent surface, thus blocking out any external light source. Like something out of Ray Bradbury, I know, but I think this couple should give it a shot.
BS, Maybe the pervert who is doing the sheep should cover his window.
Ping! I thought I was the only one who did that sort of thing.
I heard yesterday someone (Al Gore?) invented what they call "invisible walls". Those that you can look through - obviously they have one installed and don't know how to use it...