I experience it from time to time. I switch between different sleep disorders every few weeks to months. Right now I'm in insomnia. Usually I'm just plain paralyzed for a few minutes with the sleep paralysis. I can't get up to shut off the alarm clock or answer the door. It takes a good ten minutes for my mind to get my body moving. Only once or twice have I seen figures over my bed. Both times I'd say they looked like black forms of the tall big-headed alien guys popular to sci-fi. I knew it was the sleep paralysis though. Sorry I don't know how to stop it, I haven't been bothered enough by it to ask. I figure taking drugs might yeild worse side effects than the problem itself.