I had forgotten about this until this thread reminded me, but a few years after my husband and I were first married, we lived in a studio apartment. The only door inside the apartment was the bathroom door. If I wanted to read at night without keeping him awake, that's where I'd go. (I'd sit on the floor, though.)
We've since then worked out compromises about the amount of light I need to read by such that he can still sleep.
