Fish has all essential amino acids that humans need to survive. However, we could die if we had only fish in our diet. This is because fish has no Vitamin C which is crucial for human survival. Even today we use few drops of lemon when eating cooked fish. Only fish that consumes plankton has vitamin C, but only way to properly extract it is to eat fish raw with the contents of their intestines.
Sleep paralysis is a medical phenomenon where awakening person experiences temporary inability