I have found that as I'm going to sleep, if I gently tense a muscle, for example, form my hand into a light fist, it gives me something physical to focus on, and seems to reduce the jerks in severity and frequency. I'm not sure if it's just the distraction, or perhaps a placebo, but it does help me most nights. Though some unfortunately it does arse-all if they are really bad.

Just thought I'd share in the hope that it helps even one person. I've had them for about a year now and I wouldn't wish them on anyone.

Good luck!