Restless legs syndrome (RLS) is a sleep disorder that causes an intense, often irresistible urge to move the legs. This sensation is brought on by resting such as lying down in bed, sitting for prolonged periods such as while driving or at a theatre. RLS typically occurs in the evening, making it difficult to fall asleep and stay asleep. It can be associated with problems with daytime sleepiness, irritability and concentration. Often, people with RLS want to shake their legs to help relieve the uncomfortable sensation.

Evaluation  :  Periodic limb movements in sleep can  be detected in a sleep study known as Polysomnogram (PSG) .