I lie down in my bed hoping to fall asleep. I start to feel sleepy and get excited that my body will soon get the rest it needs. But as I am about to fall asleep something happens in my chest, I suddenly feel like I am fearful of something. Then the feeling goes to all parts of my body and I feel numb and restless. My beautiful sleep is gone because of this feeling that I don’t understand. What do I call this, what is happening to me?