Thank-you for your post.
It's possible for someone to spend an entire human lifetime asleep spiritually (i.e. not aware of their surroundings, or who/what they are, or why they are here). We are all actually spiritual-energy beings (souls) temporarily "locked" inside of these human animal bodies, to learn how to overcome fear under these extreme conditions.
ALL "demons" are a projection of the ego (the "self"), pretending to be whatever it needs to be to instill fear. When fear is allowed to manifest itself in the mind, it not only steals away our peace, but it provides a distraction for the ego, so it can continue operating behind the scenes.
The ego ("self") is the evil voice inside of one's head, controlled by Lucifer/Satan/Iblis, which tries to frighten us into doing its bidding, e.g. doing what is popular to be socially accepted (fear of rejection), or doing what makes the body feel good (which is frequently the worst thing for the soul/spirit-Being within), or worrying about things we have no control over (fear of the future), or that are perceived to be a threat to the life of the human (fear of physical death). The following is a very relevant quote from a film entitled "After Earth" about fear:
“Fear is not real. The only place that fear can exist is in our thoughts of the future. It is the product of our imagination (Gen. 6:5), causing us to fear things that do not at present and may not ever exist. That is near insanity. Now do not misunderstand me, danger is very real, but fear is a choice.”
Fear is also the polar opposite of faith, because where 100% faith exists, there can be no fear. So the only way to overcome the fear -- which is tied to the "self" (ego) is to destroy the ego through increasing one's faith (trust in our Creator). If you learn to overcome the fear, the "sleep paralysis", i.e. the near constant state of fear that one lives in while spiritually sound asleep, will disappear.
To accomplish this, please consider the following critically important steps:
1. Clear your mind of ALL of your preconceived notions, many of which come from whatever organized religion you frequent.
2. Practice this mind-clearing exercise frequently (taking out the trash, i.e. the worldly garbage that we fill our minds with -- garbage in, garbage out), and seek that calm, still place in your mind, where God has told us He will meet us, in the present moment (Ps. 46:10).
3. Read The Law (found in the first five books of the Bible), asking God to interpret it for you. This will begin to displace the garbage with true, spiritual food.
4. Start DOING what we are COMMANDED to do in The Law. This will help you draw closer to God, so He can in turn help open your spiritual eyes and ears, exactly as Christ teaches (John 7:16-17), which the Koran was sent to CONFIRM.
There is no other way to overcome fear. And each and every organized religion actually adds to the fear, because they set up a barrier in between us and Father (God).
You can do this,
WITH Father's Help and Guidance.
Peace be upon you.