The easiest thing you can do is not sleep on your back. If you feel you are highly stressed, perhaps some meditation or other calming activity before bed. Also, really try to get 8 hours of sleep a night as being overly tired can lead to SP episodes.
If you're still having problems, consult a doctor at a sleep center.
But above all else, understand that SP has absolutely nothing to do with anything paranormal.
Of course not, nothing paranormal happened during my SP anyway. I don't see things.
& Thanks for the advice.