I vaguely remember it happening in non-lucid dreams. It's uncommon though, but it definitely is possible. It was pretty strange every time. Sometimes, I have dreams where I am not really myself or anything. Just flashing images of stuff, it's hard to describe. Like sometimes, I have no awareness and the dream is just scenery, often very strange stuff. Like a few times I have just been absent with images of landscapes and/or strange liquid quasi fractal like patterns oscillating. That's the weirdest of them, I have to say.