Polyuria is excessive urination. Many people who experience this fairly common symptom only notice at night when they keep waking up to use the bathroom. Polyuria is different than urgency. It does not indicate a frequent urge to urinate, but rather that the body is producing more than 2.5 liters of urine every day, depending on fluid intake.
Nocturnal polyuria occurs when the body produces an excessive amount of urine at night. Defining this is difficult, though, as everyone's definition of "nighttime" is unique. If nocturnal polyuria relates to light levels or circadian rhythm, a fixed time defines when night begins. If it connects to sleep, a patient-defined bedtime is used.
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