I believe I just had my first SP experience.

I said "believe" because I'm not sure if this counts. 10 minutes after falling asleep I felt myself waking up instantly. I couldn't move at all, and my eyes were still closed. Every 2 seconds or so it felt like something was breathing into my ears extremely hard, at the third time I lost it and tried to break free; it worked.

Now I'm gonna ask if this was really SP or not, seeing as even though I couldn't move, my eyes were also closed, so I couldn't see any hallucinations (luckily). And breaking out seemed to have worked aswell, which, from what I've heard, only makes it the SP worse.