I know for a fact I have done this and ever since then have tried to but I'm never successful.

While attempting a WILD during a nap this after noon I kept getting the hypnogogic hallucination that my left eye kept opening and would immediately shut when i realized it. I wasn't sure if it was real at first but it kept getting stronger and stronger until it was a flash of a scene similar to my apartment. I found this very annoying as it was just in my left eye..