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Sleep and Aging

Frequently Asked Questions

17. What are the symptoms of periodic limb movement disorder?

Periodic limb movement disorder, or PLMD, is a condition that causes people to jerk and kick their legs every 20 to 40 seconds during sleep. PLMD often disrupts sleep -- not only for the patient but the bed partner as well. One study found that roughly 40 percent of older adults have at least a mild form of PLMD.