I think there are enough point light sources to illuminate your eInk reader without bothering your significant other too much.
On the other hand, i fall asleep quite often with the halogen lamp in my room still burning, until the timer kicks in. (45 minute timer to be switched on when you lay down to read. if you fall asleep - no problem, if you don't fall asleep you know it's time to stop when the light goes out)
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