Normally, the amount of urine your body produces decreases at night. This allows most people to sleep 6 to 8 hours without having to urinate. Some people wake up from sleep more often to urinate during the night.
This can disrupt sleep cycles. Drinking too much fluid during the evening can cause you to urinate more often during the night. Caffeine and alcohol after dinner can also lead to this problem. via MedlinePlus.gov