Yeah, actually. I absolutely hate it. I do it all the time uncontrollably, as I suffer from sleep paralysis. In fact I use kava to counter it. lol. For most people, when the brain induces the state of muscular atony to prevent you from literally acting out dreams while in REM, they'll sleep right through it. For me, I will become absolutely aware that I cannot move and it is terrifying. It either leads to me having the ability to wander worlds that I can create in an instant (while I will admit, is pretty cool. there is a lot of potential for self - therapy in lucid dreaming I think) or I will be locked in a state of absolute panic whilst visualizing terrible, terrible things and beings (shadows, demonic figures ect) with auditory hallucinations resembling that of high winds and screeching. The latter is more common that the former unfortunately and I can't stand it. Even the good times, suck, because I wake up feeling as if I haven't ever slept in the first place. Thank the kava gods that kava has eliminated this curse.
If you want to induce sleep paralysis though, I've heard a successful technique to be setting an alarm somewhere along the lines of 3+ hours after you intend to lay down to actually sleep. Wake up, quickly take a piss or something, keep the lights off, and immediately go back to sleep and crash out. Once paralysis sets in, it's pretty easy from there. But by god I hope you find a better way. lol.