I have experienced SP quiet a few times weather intentional or unintentional, I am not scared of it as I know I can snap out of it. It takes a little less then two minutes to snap out of it but it works. I have never experienced anything scary during SP. One time I almost felt like I am being electrocuted during SP one time and I was going to go into a astral projection. I took control and it stopped but I never experienced that again, I can wake myself up from a dream if lucid.

That one unusual experience with SP I couldn't explain. Best thing to do is remain clam and go with it or slowly try to move parts of your body so your body "knows" that you're no longer sleeping.

SP is much like being outside, you can sneak outside and no one sees you and locks the door to the inside. All you have to do to get there attention is knock on the door or make some racket to make them know your outside and let you in.