What term is used to describe excessive urination at night?

Nocturia is the correct term for excessive urination at night. It is a condition that leads individuals to wake up during the night to urinate often, which can disrupt sleep and lead to fatigue and other health issues. This term is particularly pertinent in discussions of urinary health, as it specifically addresses the frequency of urination during the nighttime hours, distinguishing it from other terms that may relate to urination in general.

Nocturnal enuresis refers specifically to nighttime bedwetting, typically in children, which is a different condition than simply waking to urinate. Polyuria describes a situation where a person produces an abnormally large volume of urine regardless of the time of day, and diuresis is a broader term that signifies increased urine production, which can occur both during the day and night but does not specify the timing. Thus, while each of these terms is relevant to the study of urination, nocturia specifically focuses on the nighttime occurrence, making it the correct answer in this context.