[etherextraction]

What I do is invert the colors on the iPad at night and turn the brightness all the way down. The screen on/screen off button can be programmed to be the trigger. When I press it 3 times quickly it inverts the colors. No need to jailbreak for this hack.

[lparry]

Nice tip, I'll give it a shot. It's in General -> accessibility -> triple click home in case anyone's wondering