Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) restless legs syndrome ?
    ### Response:
    Restless legs syndrome is a neurological condition that causes an irresistible urge to move the legs. The movement is triggered by strange or uncomfortable feelings, often described as crawling, pulling, or itching, deep within both legs. The feelings usually occur while the affected person is sitting or lying down and are worse at night.
    