everybody is different. u might have different sp experiences different nights. just watch out for the hypnagogic imagery, pulses and twitches, loss of feeling. after that its all downhill. and there not a really a way to check, you'll just know, trust me. it happened to me that way. i kept wondering when it would come, an when it came, i had no doubt it was sp. btw, the most important thing for a succesful wild is that ur in a comfortable position and don't let your train of thought stray off to much, try and focus on your breathing or sumthin like that.