To experience SP learn to astal project. Many people use SP to enter the astral planes. I had never had SP until i started learning to astral project. It can be frightening and it has happened to me. I have woken up in the morning not able to move but this only lasts a couple seconds. You can then wake your body up or leave your body to enter the astral planes and return when wish todo so. LOOK UP ASTRAL PROJECTION.