Characters
With insomnia, you're never really asleep; you're never really awake.
— Narrator · Fight Club

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The narrator describes insomnia as a limbo: rest never fully arrives, yet full wakefulness never does either. The sufferer is stuck between states, neither properly asleep nor properly alert. The paired negatives give the condition a flat, wearying, circular feel.
Context reviewed