question: Dear sir,        I am kalaiselvan, here to speak regarding my father's mentally disorder character. He never go to any work from his birth. He is 60 year old. He wil be like a normal person for a year in this period he never do any work, he will eat whatever avilable in home and take sleep in hearby temple, then next year his character totally  changed, In this period he never sleep in night, roaming in street, and always quarrel with our family mebber. We can't identified what type of disease this.