grannie.....just to put a little more meat on my initial answer in the light of further posts, RLS may well be associated with iron deficiency anaemia and diabetes, so please exclude those initially.
If they have been excluded or indeed identified, than appropriate treatment may will be given.
According to my doctor and my chemist, there is no cure. I get it a lot, and I have found relief by wearing flight socks and or elasticated knee bandages. I find the pressure helps. Also, daft though it sounds, no bare legs and contact between them.