I also get the twitching eyelids and muscle spasms. It is very irritating. I do agree with Bex, that it is a symptom in individuals suffering with mercury toxicity and candida. I notice that when I get my candida under control somewhat, the twitching all but diminishes, only to come back again when the candida has built up again. I have read it can have to do with magnesium deficiency, although have not tried to take any to see if it helps.