in true sleep paralysis yu shud feel tht u cant move, but if you try to move you will be able to if you try hard enuf, so ur not truly paralyzed but u feel like it. Also to keep from falling asleep, concentrate on one thing, such as your breathing. Advice that i have gotten was to count your breathing and only concentrate on that, dont think about anything else. But also dont concentrate to hard on ur breathe or you wont become lucid, so just lay there, dont move, be relaxed, and concentrate on ur breathing, and if you start to have hallucinations or wierd feelings, dont get excited or anything just let them happen.