N. are actually human products. If one starts postponing something that needs to be done, the N. starts growing out of one's back. With every day, hour, minute, it becomes stronger and pulls straws from your head. Some bind them to stones and add a heavy weight to every feeling. They attract other monsters like the Stressleech or sometimes the Conscience Crawler. Usual reasons are: forgetting to call somebody on the birthday, not getting vaccinated or checked up, not finishing some kind of job that has no precise deadline.
How to fight it
A N. grows and harasses you into paralysis. The only way to fight it, is finally finishing the task. If you do not give a damn, the N. would not come in the first place. gab