That's probably the same thing. It happens as you're falling asleep or waking up. It's pretty scary the first time it happens. You can't move, you're hallucinating your ass off. It feels like your sliding and flying all over the place, and usually it feelsl ike something evil is right next to, and sometimes it will even take shape as something.

Basically, it's like having a bad trip come out of nowhere and fuck you up while you're just waking up(even in the middle of the night) or just falling asleep.

You hear voices and noises and shit, and you feel like you're sliding up walls, off the bed, flying around, being pulled around. Plus, whatever you're dreaming, you're seeing like your really there, on top of being assaulted by an evil entity and all that other shit.

It's not fun. You can avoid it by sleeping on your stomache. It only happens when I sleep on my back.