Well, it's like you wanna wake up and you can't cuz your body just wont respond. It's like your mind sense where you are but you can't move at all you can't open your eyes, you can't scream, you can't do anything, you just have to wait till your body eventual catch up to your brain.
I'm serious I'm not making this stuff up, luckily it hasn't happened to me for quite some time now.