Anyone ever get involuntary muscle twitches?

Is this something to worry about? I think it's kinda cool actually, but I'd rather NOT have them. Yesterday it was in my left elbow area between the biceps and forearms, it was twitching quite a bit and I actually saw it moving a lot. Right now it's a bit in my upper left arm triceps shoulder area.
 
I read yesterday that it's a sign of overtraining or lack of muscle rest. This makes sense because whenever I'm tired or used my eyes too much, my eyes twitch a lot, it hasn't happened recently though.
 
If I've gotten too little sleep I do notice it with my eyes and it's annoying as hell. It might be the same for my muscles too, I do physical work all day so some times I probobly do push it a little far.
 
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