Association between nighttime urinary frequency and sleep problems among Japanese adolescents

To conduct a cross-sectional study to investigate the relationship between nighttime urinary frequency and sleep problems in Japanese adolescents.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, eating habits (breakfast, late-night eating, energy drink...