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nocÂ·turÂ·nal. adj. 1. Of, relating to, or occurring in the night: nocturnal stillness. 2. Botany Opening at night.
Nocturia can be defined as the need to wake and pass urine at night, in contrast to enuresis, where urine is passed unintentionally during sleep - see separate Nocturnal Enuresis in Children article. One episode of nocturia per night is considered within normal limits.