Periodic limb movements in sleep (PLMS)
More than 80% of people with restless legs syndrome also have periodic limb movements in sleep (PLMS).
If you have PLMS, your leg will jerk or twitch uncontrollably, usually at night while you're asleep.
The movements are brief and repetitive, and usually occur every 20 to 40 seconds.
PLMS can be severe enough to wake up both you and your partner. The involuntary leg movements can also occur when you're awake and resting.