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Objective
To conduct a cross‐sectional study to investigate the relationship between nighttime urinary frequency and sleep problems in Japanese adolescents.
Methods
A self‐administered questionnaire survey was conducted among 1757 adolescents (mean age 15.6 ± 1.1 years; 49.0% boys). The survey assessed sleep problems (sleep duration, sleep quality, and insomnia symptoms), nighttime urinary frequency,...