It is stress. Inspector Clueso drove his boss to twitching in the sanitarium. THat's what that is about.
I had severe spams and an eye twitch that lasted for 9 months. I was under enormous stress.
Later tests showed that I had almost 0 of any hormones, due to adrenal fatigue- which is from stress or a tumor.
I take hormones and tons of vitamins, espec. Magnesium and calcium which are very important to muscles- and I don't have those issues anymore.