Holding Pee While Asleep: What Are The Risks?

what happens when you hold your pee in your sleep

Nocturia is a condition that causes people to wake up multiple times during the night to urinate. While it is normal to wake up to pee sometimes, most older children and adults can usually sleep through the night without needing to. When the brain and bladder are working together well, the bladder gradually fills up overnight and waits until morning to be emptied. However, there are many ways the communication between the brain and bladder can break down, leading to nocturnal enuresis, or bedwetting. Bedwetting can be embarrassing and upsetting for teens, but there are effective ways to correct the problem, and scientists are constantly developing new treatments.

Characteristics Values
Brain-bladder communication The brain and bladder work together to hold urine while sleeping.
Brain signals The brain may tell the bladder to "hold it" until morning or wake up to empty the bladder.
Nocturia A condition causing people to wake up multiple times at night to pee, disrupting sleep quality and energy levels.
Frequent urination Peeing too much during the day but limiting trips at night.
Bedwetting (nocturnal enuresis) Bedwetting is more common in kids and teens, often with a family history.
Bladder capacity Reduced bladder capacity may be due to obstruction, swelling, infection, or pain.
Health conditions Polyuria, high blood pressure, heart disease, sleep disorders, and pregnancy can cause frequent urination at night.
Urinary tract infections (UTIs) Holding pee for extended periods can increase the risk of UTIs.
Bladder stretching Regularly holding urine may cause the bladder to stretch, making it difficult to contract and release pee.
Pelvic floor muscles Holding pee may harm the pelvic floor muscles, including the urethral sphincter, which prevents urine leakage.
Kidney stones Holding pee, especially with a history of kidney issues or high mineral content in urine, may increase the risk of kidney stones.

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The brain and bladder work together

As the bladder fills with urine, mechanosensors in the bladder wall activate an ascending pathway through the spinal cord and relay neurons in the midbrain periaqueductal gray (PAG). This triggers the reflex activation of Bar neurons, which are involved in controlling the initiation of micturition. The BarESR1 subpopulation of neurons is particularly important for triggering voiding.

During the day, when the bladder is full, it sends signals to the brain, creating the feeling of needing to urinate. The brain then sends a signal via the nerves to the bladder muscles, causing them to contract and force the urine into the urethra for elimination. The urethra is the tube that connects the bladder to the outside of the body and has two sphincters, one at each end. The internal sphincter is involuntary and controlled by the autonomic nervous system, while the external sphincter is under voluntary control.

At night, the sleeping brain doesn't receive signals from the bladder in the same way as when awake. The brain tells the bladder to hold it until morning to allow for uninterrupted sleep. If the bladder can't wait, the brain may signal the body to wake up to empty the bladder. However, if the signals are not sent or received correctly, the bladder may go into reflex mode, causing bed-wetting or nocturnal enuresis.

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Nocturnal enuresis (bedwetting)

Nocturnal enuresis, or bedwetting, occurs when a toilet-trained child cannot hold their urine during sleep, typically wetting their bed once or twice a night. It is a common problem, affecting 5-7 million children annually, and is not considered an issue until the age of 5. The condition is more prevalent in boys, and there is often a family history of bedwetting. While many children outgrow it, it can be stressful for both children and parents and may impact a child's self-esteem and social activities.

There are two types of nocturnal enuresis: monosymptomatic and polysymptomatic. Monosymptomatic nocturnal enuresis refers to bedwetting as the sole symptom, while polysymptomatic nocturnal enuresis is associated with daytime symptoms such as urgency, frequency, and wetting. Primary nocturnal enuresis occurs when a child has never stayed dry at night since toilet training, and secondary nocturnal enuresis occurs when a child has been dry for six or more months but then resumes bedwetting.

Bedwetting can be attributed to a developmental delay in the normal process of achieving nighttime control. Typically, the release of the hormone vasopressin prompts the kidneys to reduce urine production during sleep. However, in many cases of nocturnal enuresis, this hormone is not secreted in sufficient quantities. Other factors that can contribute to bedwetting include emotional stress, caffeine consumption before bed, and certain health conditions such as polyuria, high blood pressure, and heart disease.

There are several treatment options available for nocturnal enuresis. One approach is behavior modification, which may involve restricting fluids after 6 pm and implementing good sleep and toileting habits. Conditioning therapy, such as using a bedwetting alarm, is another option. This therapy consists of a sensor clipped to the child's underwear and an alarm attached to their shirt, aiming to awaken the child at the first sign of wetness. Drug therapy, such as Desmopressin (DDAVP), which mimics the natural hormone that decreases urine production at night, is also an alternative.

In summary, nocturnal enuresis, or bedwetting, is a common condition in childhood that can cause stress and impact a child's self-esteem. It is often associated with a developmental delay in nighttime control and insufficient secretion of the hormone vasopressin. Treatment options include behavior modification, conditioning therapy, and drug therapy.

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The role of the urethra

The urethra is a tube that connects the bladder to the outside of the body. It has two sphincters, or circular muscles, that control the flow of urine. The internal sphincter, located at the bladder end of the urethra, is controlled by the autonomic nervous system, which determines when to relax it. This sphincter remains closed during sleep, preventing urine from flowing out of the bladder. When a person wakes up, the internal sphincter relaxes, allowing urine to fill the urethra and creating the urge to urinate. At this point, the external sphincter, which is under voluntary control, can be relaxed to release urine.

The urethra plays a crucial role in maintaining urinary control, especially during sleep. By keeping the internal sphincter closed, the urethra helps to prevent accidental urination while asleep. This mechanism allows individuals to hold their urine until they are awake and able to voluntarily relax the external sphincter to urinate.

Additionally, the urethra is involved in the process of holding urine during the day as well. While awake, individuals can voluntarily contract the external sphincter to prevent urine flow, even when the internal sphincter is relaxed. This voluntary control allows for conscious urination at appropriate times and locations.

However, it is important to note that regularly holding urine is not advisable. Doing so can lead to urinary tract infections, pain, and bladder stretching. Holding urine can also impact the pelvic floor muscles, including the urethral sphincter, which is essential for maintaining urethral closure and preventing urine leakage. Therefore, while the urethra plays a vital role in urinary control, it is important to maintain healthy habits and avoid regularly holding urine for extended periods.

In summary, the urethra, with its internal and external sphincters, is instrumental in managing urine flow, especially during sleep when the internal sphincter remains closed. This mechanism allows individuals to hold urine until they are awake and able to voluntarily urinate. However, it is crucial to avoid making a habit of regularly holding urine to prevent potential health complications.

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Risk of UTIs

Holding urine for too long can cause bacteria to multiply, which may lead to a urinary tract infection (UTI). UTIs occur when bacteria are present in the urine. According to the Urology Care Foundation, holding in pee for extended periods can increase the risk of UTIs.

The bladder fills with urine 24 hours a day, even while sleeping, and it sends signals to the brain when it's full. During sleep, the brain may tell the bladder to hold it until morning. However, if the signals are not sent or are received incorrectly, the bladder will go into reflex mode and empty itself, resulting in bed-wetting.

While it is normal to occasionally hold in urine, making it a habit can increase the risk of UTIs and other complications. People who regularly ignore the urge to pee may experience pain or discomfort in the bladder or kidneys. Additionally, holding in pee can cause the bladder to stretch, making it difficult or impossible for the bladder to contract and release urine.

Certain conditions can also cause frequent urination at night, known as nocturia. This can disrupt the sleep cycle and lead to tiredness during the day. Nocturia can be caused by various factors, including drinking too much fluid, sleep disorders, bladder obstruction, and underlying medical conditions.

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Bladder capacity

The bladder is a hollow organ that stores urine from the two ureters leading from the kidneys. The bladder size changes with age, body weight, and race. The bladder volume increases with age in children. The normal expected bladder volume until the age of 12 is calculated as (age + 1) × 30 ml, with 400 ml expected for those over 12. The average daily bladder volume is usually 65-150% of the expected capacity. The average bladder capacity is about 10 to 18 ounces, or 300 to 400 ml, which means your bladder should be able to hold the equivalent of one to two tall glasses of water before needing to be emptied. The maximum capacity the bladder can hold ranges from 900 to 1500 ml.

In men, a bladder volume of 200–300 ml creates the sensation of needing to urinate, while for women, it is 250–350 ml. Bladder capacity may be reduced due to a bladder obstruction, swelling, infection, and pain in the bladder. An enlarged bladder is a condition where the bladder becomes larger than normal.

During the day, urination occurs when the muscles in the bladder contract synchronously, and the sphincter muscles at the bladder neck and pelvic floor relax (usually in response to the sensation of bladder fullness). This allows the free flow of urine until the bladder is empty. At night, when the bladder has stored urine and has concentrated it, we generally sleep through the night without the need to urinate, though it is also possible to wake up and urinate if the bladder feels full.

Nocturia is a condition that causes people to wake up multiple times at night to urinate. It affects more than 50% of adults over 50 and is more common in males. Before 50, nocturia is more common in females. It affects up to 1 in 3 people over the age of 30. Pelvic floor muscle exercises, also known as Kegel exercises, may prevent and treat mild stress incontinence.

Frequently asked questions

While the brain and bladder usually work together to hold urine while you sleep, sometimes the signals can break down, leading to bed-wetting, or nocturnal enuresis. This can be caused by a number of factors, including genetics, sleep problems, caffeine consumption, medical conditions, and psychological problems.

Nocturnal enuresis is more common than you might think. About 15% of kids between ages 5 and 7 wet the bed sometimes, and it's not unheard of for teenagers to experience it too. It's more common in boys, and often runs in families.

Doctors and nurses sometimes prescribe bed-wetting alarms to treat nocturnal enuresis. These alarms go off when a person begins to wet the bed, allowing them to quickly get up and go to the toilet. Eventually, you can train yourself to get up before the alarm goes off or to hold your pee until morning.

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