Is restless legs syndrome a sleep disorder?

Restless legs syndrome (RLS) is a sleep disorder, and it can also lead to insomnia, which is another sleep disorder. RLS can cause uncomfortable and distracting sensations in your arms, legs, or feet. Symptoms typically get worse both when you are inactive and at night, which means that sufferers often have a hard time getting to sleep or staying asleep. Insomnia can be a serious health problem, so see you doctor if you suspect you have RLS.