Periodic limb movement disorder

Medical condition

Periodic limb movement disorder (PLMD) is a sleep disorder where the patient moves limbs involuntarily and periodically during sleep, and has symptoms or problems related to the movement. PLMD should not be confused with restless legs syndrome (RLS), which is characterized by a voluntary response to an urge to move legs due to discomfort. PLMD on the other hand is involuntary, and the patient is often unaware of these movements altogether. Periodic limb movements (PLMs) occurring during daytime period can be found but are considered as a symptom of RLS; only PLMs during sleep can suggest a diagnosis of PLMD.

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