Thankyou for your help.. We know that Billy has a touch of arthritis and we give him the tablets that contain glucosamine, chondroitin, MSM and omega3. The pain from the arthritis does not seem to bother him too much. He has his walk in the morning and then sleeps off and on for the rest of the day and is fine. It is just at night that he is restless.
I think we will try the melatonin first, do we need to go to our vets or are they available in pet shops.