You and your spouse are on different sleep cycles; you like to read in bed; she says the light keeps her up; arguments ensue.
What you so, so clearly need to do is start wearing a pair of these consumer market Night Vision Infrared Stealth Goggles to bed.
Now you both can have some peace while you read War & Peace in complete darkness. And if the night-vision-green color starts to get old, there's also a black-and-white option, so you won't feel like you're reading Tolstoy while playing Splinter Cell.
By the bye, the UK-based company that sells these will not ship to the U.S.A. All part of a British plot to foment American marital unrest, if you ask me.