Is a sleep disorder where the patient moves involuntarily during sleep. It may range from a small movement in the ankles and toes to wild flailing of all four limbs. These movements are more common in the legs than arms and occur for between 0.5 and 10 seconds, recurring at intervals of 5 to 90 seconds. A diagnosis of PLMD requires documentation of these movements observed on a polysomnogram diagnostic exam performed in a sleep lab.
