Carolinas Sleep Specialists (CSS) provides a gold standard of care in the diagnosis and treatment of sleep apnea. The National Heart, Lung and Blood Institute estimates that more than 18 million Americans have sleep apnea. There are other conditions beside sleep apnea that can be diagnosed by a sleep study and/or consult with a sleep medicine specialist. Two of these are Periodic Limb Movements in Sleep (PLMS) and Restless Legs Syndrome (RLS).