pain
"I have suffered RLS since about 5 years of age.  Now 78.  Nothing would stop it - neurologists tried all usual medication, permoglide, rivotril, etc.  Then saw new GP in 60's who also suffered badly and he had in desperation tried oxycontin with great relief.  Suggested I tried one 
10 mg tablet before going to bed or when travelling as passenger in car - this was intolerable.
Found tablet worked like magic and although reliant on it still take same 10 mg but one tablet first thing in morning and one prior to going to bed - about 1 hour before.  Found it does not always work at night so I can be up until 3 am walking the floor nearly going insane as pain in legs is so bad.  However, 90% of time I do get incredible benefit."