The Venephobia Pokemon
Electric
This pokemon is thought to sneak into people's houses causing the victim sleep paralysis, although this is still just a theory due to how elusive this pokemon is. However, there has been one cause where somebody was found convulsing in their bed, thrashing about as they suffered horrible nightmares till death. This pokemon can travel through electrical lines undetected, hiding from its surroundings.
I took this design inspiration from Venephobia, which is the "Fear of veins" and PokeGodLover suggested the idea of sleep paralysis. And I added a lightning rod to the pokemon's chest to fit with the "Electric" theme.