Daytime Impact Sleep Study

Inclusion Criteria: * At least 2 night time voids per night * Habitual sleep of 6-9.5 hours per night * Experiencing symptoms of Nocturia greater than 6 months Exclusion Criteria: * Greater than 10 night time voids * History of sleep apnoea and PLMS (Periodic Limb Movements of Sleep) * Other sleep disorders * Signs or symptoms of: Bladder outlet obstruction, severe lower urinary tract symptoms (LUTS), interstitial cystitis, moderate to severe overactive bladder (OAB), moderate to severe as judged by the investigator stress urinary incontinence * Urological malignancies * Neurogenic detrusor over activity (e.g. Parkinson, spinal cord damage, etc.) * Central or nephrogenic diabetes insipidus * Habitual or psychogenic polydipsia (fluid intake resulting in a urine production exceeding 40ml/Kg/24hrs) * Syndrome of inappropriate antidiuretic hormone (SIADH) * Cardiac failure evidence based on physical examination, cardiac medical history and electrocardiogram (ECG) output * Uncontrolled hypertension * Uncontrolled diabetes mellitus * Hyponatraemia with sodium \<135 mmol/L * Renal insufficiency * Known or suspected clinically significant hepatic and/or biliary diseases