Fentalepsy Share definition Flag When a person continuously falls asleep after using fentanyl similar to a person with narcolepsy. The person the train was not ill they were suffering from fentalepsy. Fentalepsy by Thegarbageman2023 October 17, 2023 0 0 Get merch Get the Fentalepsy mug. Buy Now — $32.95 See more merch