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(HealthDay News) -- Periodic limb movementsare repetitive movements that typically occur in the lower limbs every 20-40 seconds during sleep, the National Sleep Foundation says.
The actions may resemble muscle twitches, jerking movements or upward flexing of the feet.
Episodes of periodic limb movement syndrome (PLMS) can last from a few minutes to a few hours. While the cause is unknown, scientists think it it related to factors in the nervous system.
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