Clinical definition: Work-in-progress parasomnia.
Symptoms: Too tired to write anything coherent, yet brain activity is heightened, causing mind to run rampant with new ideas. Tossing and turning results in mumbled dialogue followed by lucid dreams involving people and places that do not exist.
Drug regime: Caffeine and other things.
Other treatment(s): Working until body finally shuts down.
Quality of life: Parasites (characters) outlive host (author) to infect high-risk individuals (readers).