I've had it happen twice myself. It can be pretty scary. When it happened to me, I was in bed and woke up. I thought I was awake, as I could see the window across from me in the room, but I couldn't move or breathe. I could see a shadowy form on my chest, that was weighting me down. I had this feeling of dread come over me, like this thing was evil. The really scary part was not being able to breathe. In my mind I commanded the thing to leave me in the name of Jesus. Instantly, I was able to breathe again.

The funny thing is, many years after this happened to me, I was diagnosed with sleep apnea. I have to wonder now whether this was a beginning sign of it that I didn't recognize at the time.