I've had plenty of dreams of urination, in fact I had one last night, and one not that long ago. Last night, I had a whole lot coming out into a small urinal, the other time an earthquake was shaking the building...I made a mess.

Other than that, I remember one dream where I woke up and really had to go. I posted this dream in the funniest dreams thread. I was playing a video game, and had to pee so bad I was going to piss right between the legs of an AFK (player standing still because he is away from keyboard). I let it out, and the pressure build up causes it to shot up at an angle, going through the back of his head. The death registered on the screen, with it's own death icon. Then I spent the rest of the dream shooting people with my urine. I was happy to get the bunnyhopping HW who was headed back to base for health. I shot a burst of urine that was like a railgun. Slow to get there, but I lead him perfectly .

Back on topic though, I have not had any wet sheets from this. Actually, drinking more water than necessary before bed can be a dream sign, and even wake you up in the middle of the night for WBTB. Oh, all these dreams were non-lucid. Did you want specifically peeing only? Because I find people just stick lucid onto some topics when it's not needed.