Urinary incontinence (UI), a common issue, is the involuntary leakage of urine that negatively affects individuals socially, physically, and psychologically, leading to a decreased quality of life. Nocturia, which is often seen alongside UI, has similar adverse effects. Nocturia refers to the number of urinations during the main sleep period, and it should be accompanied by the intention to fall back asleep after waking up. Nocturia can arise from factors such as sleep disorders and circadian rhythm disturbances. The circadian rhythm regulates the body's biological functions, and this rhythm varies from person to person, creating chronotypes. There is a strong relationship between sleep and nocturia because nocturia leads to deep sleep loss, an increased risk of metabolic diseases, decreased sleep quality and sleep efficiency, and an increase in the number of awakenings after sleep onset. It is necessary to distinguish whether nocturia, which has a comprehensive impact, affects pelvic floor symptoms, chronotype, sleep quality, fatigue, sleepiness, and quality of life in women with UI. Therefore, the aim of this study is to examine the effect of nocturia on pelvic floor symptoms, chronotype, sleepiness, sleep quality, fatigue, and quality of life in women with UI.