I've seen a black room done really well. Very dramatic!

I remember a black-walled bedroom shown on an HGTV show. It was spectacular. Very few accessories or decorations, but those that were used were extremely well-chosen. Dramatic was how it hit me---but not just dramatic---very attractive. You have to aim for attractiveness, not just drama...

Go for it!

I say all black walls and maybe a gray ceiling. Get some bling (like mirrored dresser and nightstands and great chandelier). Get a tall, white fabric covered headboard (or make one, if you are handy)… : )

Happy Decorating!

I'd say go for it. I think a matte or satin black colour with bright white will be decadent in the bedroom. To add an element of texture, consider a black on black (of embossed damask) wallpaper as an accent wall behind the bed. You should easily be able to mix and add your actual accent colours via throw pillows and other textiles. Pick a bright accent color, it'll help the eye bounce around the space without getting lost into the black.

With such high ceilings in a deep hued room, in addition to the fabulous windows, you'll want to add alternate sources of lighting--agree...definitely go big with a very elaborate chandelier (check out the bling shown here for inspiration) and also consider your task lamps needed for reading,etc. Good luck with your project!!
~So Chic

It can be so dramatic. I would use lots of metallics and silver/chrome with mirrored furniture
Inspiration

Bathroom

The black on black is gutsy! I think a clear delineation between wall and ceiling makes a bigger impact.
Have you considered black wallpaper? It can be applied either on the wall or ceiling!