Drinking too many fluids before bed: Coffee, tea, and juice act as diuretics. The body eliminates them quickly. Overactive bladder: The bladder muscle contracts involuntarily, causing a sudden urge even when the bladder is empty. Medical causes: Diabetes, enlarged prostate in men, or fluid retention in the legs. Scientific term: Nocturia. Normal is once a night at most after age 60. More than twice a night requires examination. Quick tips: Stop drinking fluids 2-3 hours before bed.
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