Urinating more at night
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.
Other common causes of urination at night include:
- Infection of the bladder or urinary tract
- Drinking a lot of alcohol, caffeine, or other fluids before bedtime
- Enlarged prostate gland (BPH)
Other conditions that can lead to the problem include:
- Chronic kidney failure
- Drinking an excessive amounts water
- Heart failure
- High blood calcium level
- Certain medicines, including water pills (diuretics)
- Diabetes insipidus
Waking often during the night to urinate can also be linked to obstructive sleep apnea and other sleeping disorders. Nocturia may go away when the sleeping problem is under control.
To monitor the problem:
- Keep a diary of how much fluid you drink, how often you urinate, and how much you urinate.
- Record your body weight at the same times and on the same scale daily.
When to Contact a Medical Professional
Call your health care provider if:
- Waking to urinate more often continues over several days.
- You are bothered by the number of times you must urinate during the night.
- You have burning when urinating.
What to Expect at Your Office Visit
Your health care provider will perform a physical exam and ask questions such as:
- When did the problem start and has it changed over time?
- How often you urinate each night and how much urine do you release each time?
- Do you ever have "accidents" or bedwetting?
- What makes the problem worse? Better?
- How much fluid do you drink before bedtime? Have you tried limiting fluids before bedtime?
- What other symptoms do you have? Do you have increased thirst, pain or burning on urination, fever, abdominal pain, or back pain?
- What medicines are you taking? Have you changed your diet?
- Do you drink caffeine and alcohol? If so, how much do you consume each day?
- Have you had any bladder infections in the past?
- Do you have a family history of diabetes?
- Does nighttime urination interfere with your sleep?
Tests that may be performed include:
- Blood sugar (glucose)
- Blood urea nitrogen
- Fluid deprivation
- Osmolality, blood
- Serum creatinine or creatinine clearance
- Serum electrolytes
- Urine concentration
- Urine culture
Treatment depends on the cause. If excessive nighttime urination is due to diuretic medicines, you may be told to take your medication earlier in the day.
Carter C, Stallworth J, Holleman. Urinary tract disorders. In: Rakel RE, ed. Textbook of Family Medicine. 8th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 40.
Gerber GS, Brendler CB. Evaluation of the urologic patient: In: Wein AJ, ed. Campbell-Walsh Urology. 10th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 3.
Landry DW, Bazari H. Approach to the patient with renal disease. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 116.
Reviewed By: Louis S. Liou, MD, PhD, Chief of Urology, Cambridge Health Alliance, Visiting Assistant Professor of Surgery, Harvard Medical School. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.