DefinitionRestless leg syndrome is a disorder in which there is an urge or need to move the legs to stop unpleasant sensations.Alternative NamesNocturnal myoclonus; RLS; AkathisiaCauses, incidence, and risk factorsRestless leg syndrome (RLS) occurs most often in middle-aged and older adults. Stress makes it worse. The cause is not known in most patients.RLS may occur more often in patients with:Peripheral neuropathyChronic kidney diseaseParkinson's diseasePregnancyIron deficiencyUse of certain medicationsA form of RLS may be passed down in families. This may be a factor when symptoms start at a younger age. The abnormal gene has not yet been identified.Restless leg syndrome can result in a decreased quality of sleep (insomnia). This lack of sleep can lead to daytime sleepiness, anxiety or