Why do I need to pee so often at night when I lie down, despite normal tests?

I have to urinate very frequently, especially when I lie down. I feel extremely sleepy, but as soon as I lie down, I get the urge to go to the bathroom. The lack of sleep is really exhausting me. Does anyone know a solution for this? I've seen a doctor and had various tests done, but no medical condition was found."
Why do I need to pee so often at night when I lie down, despite normal tests?
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