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hey hey hey! who said anything about fear???? im a valkyrie remember! ...not a lil bunny rabbit.
Fear has many faces and levels, some great some small. What I sense from you is fear, as in uncertainty, of the unknown. Which is normal. If you didn't have this feeling I'd say something is wrong with you. Of course if you were chronically terrified that something was trying to get at you in your sleep I'd also say you something nots cool in your head. But your uncertainty, to me, seems to be more of a curiosity than either an unhealthy indifference or irrational obsession.
I think that by simply sleeping in the same spot over a period of time and feeling safe in that spot you charge that area with energy that naturally protects you from most intruders. I would suggest that if you visualize this energy that you also treat it like the dream catcher and every so often just banish the energies to cleanse the room and re-do the visualization of the energy. Also make sure you yourself are cleansed if this is what you you do. If you are not cleansed and have enough negative energy than visualizing a wall of protection around your room could possibly surround you with negative energy instead. The easiest way to deal with intruders is to not acknowledge them. Don't give them the attention they are trying to pry from you and they will go away. Even if they make some noise at first, they'll still go away.