yes, I get this. The only definite cause I know for mine - and this is sometimes and not always - if I go too long before eating the first sign my blood sugar is too low is the shakes. Since I am a diabetic who is completely controlled without meds this is a big sign for me.
SOmetimes I get it and it's not the sugar, but when that happens it's more like a spasm and less like I shake. I get spasms all over - my eyes, arms, hands, legs will just suddenly twitch. There's absolutely no pattern that I can discern from the twitching spasms or no reliability on when they will occur. I haven't even mentioned it to my dr yet.