Thank you Madlegs 1 for your suggestion of cutting oxolate foods. I'v just had my 5th good night - just the odd blip but if I stay put and ignore it I go to sleep again. Another associated symptom which has gone is that several times during the night I used to wake with pins and needles from the waist down and a feeling of a full bladder, even after emptying it, combined with violently jerking legs. I had an MRI for the pins nd needles but no spinal cord lesion found.
Unfortunately, cutting oxolates has done nothing for the daytime rls.