Although I gotta say that every once in a while something weird happens.
I feel my body relaxing and going numb a lot to the point where I'm able to tell that I wont last any longer. However, I usually move around in the bed a lot and thus, in that moment, even though I try to move I can't move at all. So I gotta like, force my body to move which I usually manage to do. And when I lie back to sleep again, body goes numb again and of course, I'm unable to move my body.