well i tryed with the WILD technique. I satrted to does off then all fo a sudden i heard a “CRASH!!”, and my body started tingling all over. What was this?
Hi Backlash 
That was the so-called “vibrations” they occurr when your astral body is dettaching from your physical body and apparently or maybe your body did dettached from your phy-body. I think the Crash was when you were out of your body or vice versa when you came back to your body. I can’t really help you since i don’t have much knowledge on this.
that happened me last night, i suddenly remembered it after reading this. I was sleeping on my back which i never do cus i either get nightmares or weird states of consciousness and i remember flinching upwards and hearing a crash sound. At the time i immediately thought something was wrong but then ignored and forgot about it a moment later and went back to sleep.
These sounds and vibrations are likely to be caused by your body falling asleep. The sounds don’t come from an external source but arise from your brain. It’s perfectly normal and happens every night when we fall asleep. But you only notice them if your mind keeps awake during all this, as you experienced for instance while doing WILD 
lol its scary innit big bang when your almost a sleep kinda makes you jump 
doesn’t happen much but its pretty weird just as your about to nod of you wide awake.
+1