PLMD is classified as a movement disorder that occurs only during sleep. It is characterized by a jerking movement of either the legs and/or arms. These movements are oftentimes subtle jerks lasting anywhere from half a second to no greater than five seconds in duration that may or may not cause arousals during sleep. These arousals may cause interruptions in one’s quality of sleep resulting in excessive daytime sleepiness. Treatment for PLMD usually involves medication.