Allegedly, making an active effort towards lucid dreaming increases the rate of incidence of sleep paralysis by some ridiculous amount. Which makes sense, because in lucid dreaming you're essentially trying to trick your brain into retaining conscious processing during a dream.

Never tried myself, but if you're not afraid of the paralysis demons, it's a win win. You either succeed and get to lucid dream on the regular which kicks ass, or you don't succeed and start having nightly visits from Slim Jimmy.

Sometimes when I get sick I can sense that it might happen when I go to sleep. I think it's mainly about being the right amount of tired, though.

The other key element is having enough brain activity to keep your eyes open or to reopen them while your body tries to start REM sleep. People say stress will do that, and that tracks with my experience.

Also, try sleeping on your back. I've never had it while sleeping in any other position. It could vary from person to person, so maybe try sleeping in different positions.

For me it's having a large sleep debt and smoking weed.