This doesn't work so well with e-readers (because of the contrast) and my old eyes, and probably wouldn't work at all with those tending to motion sickness, but when I was a wee thing I used to sit in the back seat of the car at night while my dad drove, and hold my book UP to the rear window so I could use the headlights of cars behind us /street lights to illuminate the book enough to read. Intermittently, because the readable-level of light came and went fast.
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