Restless legs syndrome and heart disease

This link discusses research showing a potential link between restless legs syndrome (RLS) and heart disease. This was based on an observational study in thousands of women. The results showed that heart disease was twice as likely in those with RLS than in those without. This does not mean that RLS causes heart disease, only that the two conditions are related somehow. It could be that some of these women also have other conditions, like obstructive sleep apnea, that increases risk of heart disease.