Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Unverricht-Lundborg disease ?
    ### Response:
    Unverricht-Lundborg disease is an inherited form of progressive myoclonus epilepsy that is characterized by episodes of involuntary muscle jerking or twitching (myoclonus) that increase in frequency and severity over time. Episodes of myoclonus may be brought on by physical exertion, stress, light, or other stimuli.
    