Pretty experienced with sleep paralysis, though I find it afflicts me much more when I'm on a course of opiate painkillers, but it does happen sometimes when I'm not. Assuming it has some connection to the dopamine pathways.
Anyway, as others have said, the toe wiggle technique is a good way to get out of it, as well as once youve gone through it a few times, its easier to ride it out without anxiety.
Now if I could get the occasional orthostatic hypoteneion to go away...that'd be great. Randomly, if I get up from a deep sleep to pee or something, I'll get super dizzy, thumping/buzzing in my ears, nauseous and have to lay down. Apparently its from blood pooling in the legs while lying down and then a sudden drop in blood pressure upon standing. It sucks, thankfully it only happens about 3 times a year, but its rough when it does.