One of main reason of nocturia is known as nocturnal polyuria. For the treatment of nocturia caused by overactive bladder, the combined therapy of anticholinergics plus behavioural modification has been established as the first line therapy. However, nocturia mainly comes from polyuria has been treated with desmopressin pharmacotherapy and the effect of behaviour modification education has not yet evaluated. Therefore, in this study, short term synergistic effect of combinational treatment of desmopressin and SyBeMeP (Systemized Behavioral Modification education Program) comparing desmopressin monotherpy will be evaluated in patients with nocturia.