What's your interpretation for "pigeonhole bedrooms" in the following context from "Manhattan Transfer" by Dos Passos:
Jimmy is walking alone, half-drunk in the middle of the night.
His knees were wet, a slow trickle started down his back, there were chilly cascades off his sleeves onto his wrists, his whole body itched and tingled. He walked on through Brooklin.
Obsession of all the beds in all the pigeonhole bedrooms, tangled sleepers twisted and strangled like the roots of potbound plants. Obsession of feet creaking on the stairs of lodginghouses, hands fumbling at doorknobs. Obsession of pounding temples and solitary bodies rigid on their beds.