Hi, I used to get RLS about once every year or two in the summer for a few nights and then it would disappear completely. It was so rare it didn't bother me. Then at Christmas just gone I had a longer episode. I went for a blood test and my folate and magnesium levels were perfect. I went to a chiropractor and he found a stiff joint in my lower spine which might have been contributing. Then my rls disappeared spontaneously. Four months later suddenly it's back. I really can't work out its cause.