Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Urinary Incontinence in Children ?
    ### Response:
    The exact cause of most cases of nighttime UI is not known. Though a few cases are caused by structural problems in the urinary tract, most cases probably result from a mix of factors including slower physical development, an overproduction of urine at night, and the inability to recognize bladder filling when asleep.
    