The main reasons for peeing frequently at night (a condition called nocturia) include producing excess urine at night, decreased bladder capacity, and underlying medical conditions. Common causes are increased urine production at night (nocturnal polyuria), low bladder capacity due to infections or inflammation, enlarged prostate in men, overactive bladder, drinking too much fluid or diuretics close to bedtime, urinary tract infections, diabetes, and sleep disorders like sleep apnea. Aging also plays a big role, as the body produces less antidiuretic hormone, causing more urine production at night and weaker bladder muscles. Other contributors can be certain medications, pregnancy, and conditions like kidney disease or heart failure. Tracking fluid intake, urination frequency, and discussing symptoms with a healthcare provider can help identify the cause for personalized treatment.