Restless legs syndrome (RLS) is a condition that causes you to feel discomfort in the legs. When you get into bed at night and try to fall asleep, or when you are sitting on a plane, train, or in a movie theater, you feel discomfort in your legs, which eases when you move them.
A survey conducted in Japan estimated that 2% to 4% of the population, or 2.5 to 5 million people, suffer from RLS. It is thought that about 700,000 of these people need treatment.