Why is the stream of urine worse at night?

Why is the stream of urine worse at night?
Why is the stream of urine worse at night?

Do you ask yourself: Why is the stream of urine worse at night? Why does urine flow decrease at night? Aka. The Nighttime urine flow enigma: Why It Worsens at Night? You are in the right place.

This phenomenon is not just a figment of your imagination. In fact, many people experience this issue due to various factors that disrupt normal sleep patterns and bladder function. Let’s delve into some proven facts about why urine flow worsens at night and how you can address it with the help of iPeeWell and their innovative home uroflowmetry device.

Table of Contents

Collection of all Q&A: UROFLOWMETRY: A comprehensive guide – preparation, factors, results, cost

The Science Behind Nighttime Urination

According to a study published in the Journal of Urology, the body’s natural circadian rhythm plays a significant role in nighttime urine flow[1][2][3][4]. As we sleep, our bodies produce hormones that can affect bladder function. Additionally, lying down for extended periods may put extra pressure on the bladder and cause it to contract more frequently.

The usual functional bladder capacity is approximately 350 – 400 mL. Urine production at night is usually less than one-third of the total daily urine output. If the nocturnal urine volume exceeds this amount, the patient is deemed to have nocturnal polyuria.

Another study published in the European Urology journal reveals that people with overactive bladders or urinary incontinence are more likely to experience nighttime urination issues. This is due to an increased muscle activity in the bladder, causing it to contract and release urine at irregular intervals.[6] This includes patients with Parkinson’s disease, multiple sclerosis, and advanced diabetes.

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Night urine is generally more concentrated and thus causes more dysuric problems.

From practice

In urology practise we most often see people who drink too much fluids before the sleep. The first advice is not to drink large amounts of fluids towards the evening. Also, don’t drink fluids at night when you wake up. Do not drink alcohol or caffeine before bed. Diuretics also increase the amount of urine. Patients with heart failure also have larger volumes of urine at night. It is essential that you bring a urination diary with you to your visit to the urologist (located in the documents section at the top of this article or in our app), from which a lot of information can be obtained[5]. The use of voiding diaries cause a “bladder training effect” and influence the frequency of night voids[7]. The diary shows your functional bladder capacity. It also shows how much your bladder stretches the most before you go to the toilet or before waking you up. In practice, we often see that people wake up for other reasons and go to the toilet at the same time. Most of the time, we find that people wake up because of back problems.[1]

Addressing Urine Flow Issues

While these factors can contribute to worsened urine flow during the night, there are solutions available. We have already mentioned some solutions for nocturnal urination in the above chapter. Measuring the strength of your jet certainly helps in diagnostics. This is done with uroflowmetry device. iPeeWell offers a home uroflowmetry device that can help diagnose and monitor bladder function issues. This innovative tool measures the speed and volume of your urine stream, providing valuable insights into any potential problems. The application for mobile devices also contains a micturition diary, which automatically calculates certain parameters that the urologist needs in his decisions.

Conclusion of Why is the stream of urine worse at night.

So why does the stream of urine worsen at night? It’s a complex interplay between our body’s natural rhythms, hormones, and bladder function. But with the help of iPeeWell.com and their home uroflowmetry device, you can take control of your urinary health and address any issues that may be affecting your sleep quality and overall well-being. Your history together with voiding diary and uroflowmetry help in finding answers. As always, if you have urological problems, consult your urologist.


  1. Denys MA, Viaene A, Goessaert AS, Van Haverbeke F, Hoebeke P, Raes A, Everaert K. Circadian Rhythms in Water and Solute Handling in Adults with a Spinal Cord Injury. J Urol. 2017 Feb;197(2):445-451. doi: 10.1016/j.juro.2016.08.001. Epub 2016 Aug 6. PMID: 27506697.
  2. Raes A, Dehoorne J, Hoebeke P, Van Laecke E, Donckerwolcke R, Vande Walle J. Abnormal circadian rhythm of diuresis or nocturnal polyuria in a subgroup of children with enuresis and hypercalciuria is related to increased sodium retention during daytime. J Urol. 2006 Sep;176(3):1147-51. doi: 10.1016/j.juro.2006.04.054. PMID: 16890713.
  3. Graugaard-Jensen C, Rittig S, Djurhuus JC. Nocturia and circadian blood pressure profile in healthy elderly male volunteers. J Urol. 2006 Sep;176(3):1034-9; discussion 1039. doi: 10.1016/j.juro.2006.04.046. PMID: 16890685.
  4. Fitzgerald MP, Brubaker L. Variability of 24-hour voiding diary variables among asymptomatic women. J Urol. 2003 Jan;169(1):207-9. doi: 10.1016/S0022-5347(05)64069-4. PMID: 12478137.
  5. Stav K, Dwyer PL, Rosamilia A. Women overestimate daytime urinary frequency: the importance of the bladder diary. J Urol. 2009 May;181(5):2176-80. doi: 10.1016/j.juro.2009.01.042. Epub 2009 Mar 17. PMID: 19296975.
  6. Jiang JF, Leung AK, Pettitt-Schieber B, Nabavizadeh R, Thomas RL, Brown M, Hafford D, Lay AH, Hammett J, Carney KJ, Filson CP, Master VA. Efficacy of Percutaneous Tibial Nerve Stimulation for Overactive Bladder in Women and Men at a Safety Net Hospital. J Urol. 2020 Feb;203(2):385-391. doi: 10.1097/JU.0000000000000539. Epub 2019 Sep 13. PMID: 31518202.
  7. European Guidelines of Urology: Management of Non-neurogenic Male LUTS

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