CBD oil is a derivative of hemp products that contain cannabidiol but not THC, the active substance in cannabis.
It, therefore, has no psychoactive (euphoric) effect but provides a relaxing effect that can be positive for occasional RLS relief.
But it is not a cure for restless leg syndrome.
The underlying cause (iron deficiency, dopamine, venous insufficiency, drugs, etc.) must be diagnosed.
It can be used during a crisis to try to contain it.
It also contributes to sleep which is often disturbed by restless legs.