nocturia

Purposeful urination at night, after waking from sleep; typically caused by increased nocturnal secretion of urine resulting from failure of suppression of urine production during recumbency or incomplete emptying of the bladder because of obstructive lesions in the lower urinary tract or detrusor instability. SYN: nycturia. [noct- + G. ouron, urine]

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noc·tu·ria näk-'t(y)u̇r-ē-ə n urination at night esp. when excessive called also nycturia

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n.

the passage of urine at night. In the absence of a high fluid intake, sleep is not normally interrupted by the need to pass urine. Nocturia usually occurs in elderly men or women. In younger men or women, less urine is made at night than during the day, but this rhythm is lost with age in both sexes. Men may have additional problems arising from benign prostatic hyperplasia (see prostate gland), but transurethral resection of the prostate often does not reduce nocturia.

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noc·tu·ria (nok-tuґre-ə) [L. nox night + -uria] urinary frequency at night; called also nycturia.