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Restless legs syndrome (RLS), a familial disorder causing unpleasant crawling, prickling, or tingling sensations in the legs and feet and an urge to move them for relief, is emerging as one of the most common sleep disorders, especially among older people. This disorder, which affects as many as 12 million Americans, leads to constant leg movement during the day and insomnia at night. Severe RLS is most common in elderly people, though symptoms may develop at any age. In some cases, it may be linked to other conditions such as anemia, pregnancy, or diabetes.

Many RLS patients also have a disorder known as periodic limb movement disorder or PLMD, which causes repetitive jerking movements of the limbs, especially the legs. These movements occur every 20 to 40 seconds and cause repeated awakening and severely fragmented sleep. In one study, RLS and PLMD accounted for a third of the insomnia seen in patients older than age 60.

RLS and PLMD often can be relieved by drugs that affect the neurotransmitter dopamine, suggesting that dopamine abnormalities underlie these disorders's symptoms. Learning how these disorders occur may lead to better therapies in the future.

Table of Contents

• An Introduction to Sleep Disorders
• How Much Sleep Do We Need?
• Insomnia
• Sleep Apnea
• Restless Legs Syndrome
• Narcolepsy
• Tips for a Good Night's Sleep
• Learn more about Circadian Rhythms
• Learn more about Dreaming and REM Sleep

» Next in Series: Narcolepsy

Last reviewed:
  On 7 Sep 2006
  By John M. Grohol, Psy.D.

A neurotic is a man who builds a castle in the sky. A psychotic is the man who lives in it. A psychiatrist is the man who charges them both rent.
-- Jerome Lawrence