Waking just once a night to void hardly bothers patients at all whereas several episodes of nocturia each night can significantly affect quality of life (QoL). This major study from Finland aimed to look at three aspects of the impact of nocturia. First, the different degree of bother depending on age and sex; second, the relationship between nocturia frequency and bother, and third, the impact of nocturia on health-related QoL measures. A total of 1,709 men and 1,888 women, aged 18-79, drawn randomly from the population, were studied.