for a few years, I've been getting stuck in my sleep. I don't know what it is. Sometimes it's when I sleep in the day, then sometimes when I sleep at night. (I also noticed that this only happens when I sleep on my back) I know I'm waking up, but my body doesn't want to. My eyes are shut, and I can't open them. My arms feel like they weigh 1000 pounds. It's so hard to breath, as if someone were sitting on my chest. And it scares me so badly. But the more times it happened, the more I was able to work with it. I only got as far as moving my fingers, or lifting my arm about an inch. or even opening my mouth and slurring some sounds. But it still scares me to death. Does anyone have any idea what this is??? Please help. Thank you.