Answer:
Modafinil acts to combat excessive daytime sleepiness (EDS) and cataplexy, the leading symptoms of narcolepsy, by stimulating sleep-suppressing peptides (orexins) in the brain.
First answer by Gale Ency of Neuro Dis. Last edit by Gale Ency of Neuro Dis. Contributor trust: 14 [recommend contributor recommended]. Question popularity: 1 [recommend question].