Rather than black-on-white (as with paper), I've started using an ivory over very dark blue. One of my most common uses is the same as yours, reading at night

Rather than black-on-white (as with paper), I've started using an ivory over very dark blue. One of my most common uses is the same as yours, reading at night without disturbing my wife. I find that light-over-dark is much easier on the eyes when viewing in the dark.