ILGenWeb | USGenWeb | WorldGenWeb. My name is Mary Kathryn Kozy, and I'm the County Coordinator for Lawrence County. I want to thank Allison Mushrush, Celia Tomlin, and Laurel Treat for the work they have done on the site in past years. This site is part of the Illinois GenWeb Project which is a part of the USGenWeb Project.
Periodic Limb Movement Disorder. Periodic limb movement disorder involves a rhythmic jerking of the legs and sometimes arms, which may result in poor quality sleep and daytime fatigue. Unlike restless leg syndrome, these movements are involuntary and usually take place when a person is asleep.
Periodic limb movement disorder (PLMD) is a condition that was formerly called sleep myoclonus or nocturnal myoclonus. It is described as repetitive limb movements that occur during sleep and cause sleep disruption.rue PLMD -- the diagnosis of which requires periodic limb movements in sleep that disrupt sleep and are not accounted for by another primary sleep disorder including RLS -- is uncommon.