I twitch...therefore I am

This is just driving me NUTS! Everytime I get even remotely comfortable and I start to relax, my whole body goes into this convulsive thing where it jerks really hard once. It's happened so many times now, it's actually getting painful! I've had it and I've seen it when ya first fall asleep and ya get that hypnic jerk thing where all your muscles spasm at once. But once it happens once, it usually goes away. This happens everytime I start to relax. It's even happening at times when I'm not sleeping yet. I'm just relaxed, eyes closed or open doesn't matter...and then WHAM! One really violent jerking movement and I'm awake again! It's starting to affect my general demeanor. I'm not even a nice person anymore these days! LOL This lack of sleep thing is completely destroying my whole nice-girl persona! lol I'm yellin at people left and right!