Turned the screen brightness on your iPad (or iPhone) all the way down? Still too much light for you? Reading in bed next to someone whose eyelids seem to amplify light the same way a magnifying glass turns the sun into a death ray for ants?
Then this tip is for you. With a simple triple-tap of the top button or Home button on your iPad, you can dim the screen way beyond its usual limit.
Although your whining, over-sensitive bed partner will likely just start complaining about the noise of those button taps instead.