SP is not possible to induce, it's a rare sleep disorder that only small number of people ever experience, i very highly suggest to not aim for it. http://www.dreamviews.com/wake-initi...explained.html
Also i am against Shalashaska's suggestion, you will end up ruining sleep health and it will most likely wouldn't work anyway.

@Shalashaska Doesn't sounds like an actual SP. Are you not able to move no matter how hard you try?

*Moved to Beyond Dreaming*