I have had sleep paralysis two times in my life. I was in the 5th grade or so when it happened.
I remember my alarm going off, I was lying on my stomach both times, and when I realized I couldn't move my arm to shut the alarm off I panicked. I think I tried to call for my mum, I'm not 100% sure. Either way, after my panic attack, my body 'woke up' I don't recall feeling any sort of presence, just my fear of not being able to move.