Restless Legs Syndrome (RLS) is defined as an uncontrollable urge to move the legs, which is often accompanied by a tingling sensation in the legs. There are some treatments than can help people deal with this condition.
O.E. restleas "deprived of sleep," from rest (1) + -leas "-less." A general Gmc. compound (cf. Fris. restleas, Ger. rastlos, Dan. rastlös, Du. rusteloos). Meaning "stirring constantly, desirous of action" is attested from late 15c.