That sure sounds scary; but I still feel it is nothing much to worry about. What are you eating before you go to sleep? Certain foods can induce nightmares like that. Do you have any subconscious fears?

The Wiccans have a lovely spell for nightmares. I am not a Wiccan so I cannot remember it right now. But perhaps you could research it? Or I will research it for you and post it here. You can use that spell against nightmares and have a peaceful sleep.