If you are going to sleep, try this: keep your mind focused at yourself, and don't let yourself to fall into dreamimages that come into to your mind, calling you to go with them. Eventually, if you keep focus enough, you will drop into a dark space. There, you will come to feel the presence of the Other.
At first, it is just a hounting feeling, that you are not alone, but as soon as you feel this, you realize that there is another presence besides you; and as soon as you see it, It sees you.
Your thought arise, "who is it", and as an echo, you hear it say the same thoughts, as there were two of you, and feel it close in, as if taking over you. At this point, you will feel ultimate panic, kind of which you have never felt, and jump out of your bed, feeling foolish.
There is no one known to resist that urge to panic. Maybe you are the first. Maybe you are unable. But you after the first one, every one feels odd pull to that darkness again.