Fluid restriction does not help people who have nocturia due to gravity-induced third spacing of fluid because fluid is mobilized when they lie in a reclining position. Compression stockings may be worn through the day to prevent fluid from accumulating in the legs, unless heart failure or another contraindication is present. Drugs that increase the passing of urine can help decrease the third spacing of fluid, but they could also increase nocturia. Medications
ADH replacements such as Desmopressin and Vasopressin
Selective Alpha-1 blockers are the most commonly used medicine to treat BPH. Alpha-1 blockers are first line treatment for the symptoms of BPH in men. Doxazosin, terazosin, alfuzosin and tamsulosin have all been well established in treatment to reduce lower urine tract symptoms (LUTS) caused by benign prostatic hyperplasia. They are all believed to be similarly effective for this purpose. First generation alpha-1 blockers, like prazosin are not recommended to treat lower urinary tract symptoms because of their blood-pressure-lowering effect. Later generation drugs in this class are used for this purpose. In some cases alpha-1 blockers have been used in combined therapy with 5-alpha reductase blockers. Dutasteride and tamsulosin are on the market as combined therapy and results have shown that they improve symptoms significantly versus monotherapy. If urinary tract infection is causative, it can be treated with urinary antimicrobials. Antimuscarinic agents such as oxybutynin, tolterodine, solifenacin are especially used in patients who suffer from nocturia due to an overactive bladder and urgency incontinence because they help bladder contractility.
Nocturnal polyuria
Nocturnal polyuria is defined as an increase in urine production during the night but with a proportional decrease in daytime urine production that results in a normal 24-hour urine volume. With the 24-hour urine production within normal limits, nocturnal polyuria can be translated to having a nocturnal polyuria index (NPi) greater than 35% of the normal 24-hour urine volume. NPi is calculated simply by dividing NUV by the 24-hour urine volume. Similar to the inability of control urination, a disruption of arginine vasopressin (ADH) levels has been proposed for nocturia. Compared with the normal patients, nocturia patients have a nocturnal decrease in ADH level.Other causes of nocturnal polyuria include diseases such as

congestive heart failure
nephritic syndrome
liver failure
lifestyle patterns such as excessive nighttime drinking
sleep apnea increasing obstructive airway resistance. Obstructive sleep apnea sufferers have shown to have increases in renal sodium and water excretion that are mediated by elevated plasma atrial natriuretic hormone (ANH) levels. ANH is released by cardiac muscle cells in response to high blood volume. When activated, ANH releases water, subsequently increasing urine production. Bladder storage
Normal human bladder storage capacity varies from person to person and is considered 400 – 600 mL. A bladder storage disorder is any factor that increases the frequency of small volume voids. These factors are usually related to lower urinary tract symptoms that affect the capacity of the bladder. Some patients with nocturia have neither global nor nocturnal polyuria according to the above criteria.