You'll be having a dream... blah blah blah. Not lucid. And you kinda have to pee in your dream, so you head over to a toilet. But you actually have to pee in real life. So you sit down on the toilet, and since you have to go in RL, your body is trying to wake you up, so now you're on the toilet, but you can feel that you're in your bed. You're like half asleep, and you really have to go now.

So you try to go to the bathroom, to let it all out, because I mean, you're in the right place to do it, right? But for some odd reason your body won't let you go. After like 3 minutes of internal arguing, you realize that you're lying in your bed. Good thing you didn't go. You get out of bed and go to the bathroom.

P.S. I know your body won't actually wake you up to go to the bathroom, but that's the only logical explanation I could think of other of just being a complete coincidence, which it could have been. And this has happened to me like 10 times in my life lol.