Well..hmm..ell I tried this almost accidentally today, I randomly woke up and I soon realised that I had a chance so I didn't open my eyes or move (but I think I did)
Afree like 3 seconds I could feel vibrations in my body and my heart started beating faster and sounded as if there was a speaker relaying my heart beat, it was incredibly loud. . I found it really difficult to keep my eyes shut and remembered that there's a possibility of getting sleep paralysis if you try to open them during that short period. .after around 10 seconds 5ge ringing stopped and my heart beat went back to normal.I waited an ectreatment 10 seconds..but when I tried sitting up I did some reality checks only to realise I was awake. .was the problem that I only slept for about three hours thus no REM or I waited too long to open my eyes..Also I moved one of my finger a little...but for a first try it was good..also it took me around an hour to fall asleep again