Studies found that for people over the age of 70, over two-thirds of men and women over 70 urinate at least once per night, and up to 60 percent go twice or more each night. The studies show that it is very common for most people to wake up once a night, and it becomes more common as you get older. Normally, you should be able to sleep six to eight hours during the night without having to get up to go to the bathroom. People who have nocturia wake up more than once a night to urinate. Frequent nighttime urine may due to excess fluid intake, enlarged prostate or overactive bladder.