The urge to urinate when lying down to sleep isn't necessarily unusual. The primary reason is that when lying down, fluids in the legs can more easily flow to the kidneys, according to the health website Healthline (USA).
The feeling of needing to urinate as soon as you lie down at night, if it happens frequently, can lead to nocturia (nighttime urination).
With this amount of fluid, the kidneys process it and convert it into urine, which flows into the bladder, resulting in the frequent need to urinate. However, if this happens regularly, forcing the person to sit up to urinate and disrupting their sleep, it becomes nocturia (nocturia).
Older adults and obese individuals are at a higher risk of nocturia (frequent urination at night) than average. The U.S. National Institutes of Health (NIH) describes nocturia as one of the most bothersome urinary symptoms, and it is quite common.
For women who have just given birth, nighttime urination can be more severe. This is because childbirth affects the function of the pelvic floor muscles. Sleeping in a position that puts pressure on the bladder can increase the urge to urinate when lying down.
People with enlarged prostate glands or problems with the uterus or ovaries may also experience the urge to urinate if they lie in a position that puts pressure on the bladder. Additionally, patients diagnosed with bladder muscle dysfunction, also known as overactive bladder, may also feel the urge to urinate as soon as they lie down.
Health problems that contribute to nocturia include bladder stones, bladder cancer, cystitis, pelvic tumors, or urinary tract infections.
Besides physical issues, psychological factors can also cause a sudden urge to urinate after lying down. For example, you may have a habit of needing to urinate before going to bed. In theory, this is reasonable because we sleep for 7-8 hours and need to empty our bladders.
However, forcing yourself to urinate unnecessarily before bed triggers a reflex in the brain and bladder, stimulating the urge to urinate as soon as you lie down.
To reduce the urge to urinate at night, experts recommend lying or sitting with your legs elevated above your heart for about an hour. This helps fluid from the legs travel to the kidneys and out of the bladder sooner, thus reducing the urge to urinate in the evening, according to Healthline .
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