We have Hunter Douglas designer screen shades in our MB (and other rooms as well). You can choose from very sheer, to less sheer, to opaque (or practically so), in a variety of colors and patterns (I think all the fabrics are actually vinyl, and are easily wiped free of dust).

We used a fairly sheer black fabric in our MB, and have micropleat black out shades installed behind them. I lower the micropleat shades at night, and then raise them all the way up in the morning. Little pinholes of light do come in through the holes for the strings, but the room is still plenty dark. The micropleat shades also come in a privacy version, which probably allows light to shine through (no idea how much), while preserving the privacy of the rooms occupants.

I have giant windows in my bedroom and can't tolerate light when sleeping. I used pleated cellular blackout blinds, inside mount with white sheers on a rod. I raise the blinds all the way up during the day. I love the look of the light streaming in through the sheers. The negative is since the blinds are pleated I must vacuum them frequently and can never wash them. They are three years old, look fine but I will probably replace them in the next three years. Because of this issue I just ordered shades for the living room. No pleats to gather dust.

Plantation shutters. Mine were made locally but I think you can get them thru Cosco, HD, or Lowe's.

Thanks for the ideas! I think the sheers on rods could work, but I really like the window trim and hesitate to hide it. For plantation shutters, I wouldn't be able to open the window behind the bed---but it's not easy to access anyway with shades and the bed so maybe wouldn't be a big deal.