Well, that's the weird thing. I had read that Calcium deficiency is a potential cause as well. But I have been taking a liquid calcium-magnisium suppliment since my first pregnancy. My MW suggested it to help with leg spasms (ie, "charlie horses") and it worked like a charm. So I find it hard to believe that it's a calcium, in my case. I've also read that it's potentially a B complex deficiency. Haven't tried that yet.
I can't imagine that I'm tired! I've been going to bed by 9:30 (sometimes 8:30!) at night and getting up at 6 - I'm getting 9 hours of sleep. Okay, I am tired, but not more than I'd expect at this stage. I don't really have any outstanding stress (other than being pregnant!) factors. I rather discount the fatigue/stress.
Lemme know if calcium helps, Patti. I realize I had twitches during my first pregnancy too, but never realized that it was related to the pregnancy until they started this time too. I don't recall them lasting for the duration - only maybe sporadically during 1st trimester. Only 4 more weeks of that!