Is this controlable or is it dictated by the book?
In the Nook and Kindle android apps, you can control the background through the settings. The Kindle does it throught the fonts button and the Nook button is in the settings. The black background sure goes a long way in keeping a sleeping spouse happy.
Accessibility Options might o it for you.
Black Background and Light Text is good for the Vision Impaired.
Naa Doesn't seem to have a way to flip the colors. Would be nice
