"People are still and the curtains are hanging, and the lamps are dim and the fragrance is straight" is an arrangement of four modes of things, which together form a scene.
Quiet: It’s quiet at night and you can’t hear people’s noise.
Curtain hanging: The door curtain hangs straight and does not move. No one comes in or out, and no wind blows.
Light dim: dim light. The oil lamps of the ancients required frequent "driving (using a metal tool to push the wick forward)" to make them bright. The dim light means that the person has lied down and no longer needs bright light.
Xiang Zhi: The smoke from the incense lit in the room is upward by the author, which also proves that there is no wind.
The people are still, the curtains are down, the lights are dim, and the fragrance is straight, creating a quiet night scene in the bedroom.