Periodic Limb Movement Disorder (PLMD) 

Periodic Limb Movement Disorder (PLMD) refers to involuntary movements of the legs and arms during sleep. These movements cause arousals and sleep disturbances. PLMD are observed mostly in those over 50 years of age and are rarely in those under 30. PLMD are more common in people who have kidney disease or narcolepsy. Individuals with PLMD may also experience Restless Legs Syndrome (RLS)