When I was a child, I suffered from nightmares or intense dreams. They were so bad that eventually I learned how to lucid dream and fought off my dream nightmares. I got so good at it, I stopped my nightmares. Which somewhat disappointed me because I began to enjoy turning myself into a child superhero.
The nightmares started up again recently once I started the meditation exercises I found in a book by Franz Bardon. Some dreams would be the icons that people speak about in regards to sleep paralysis. I fought off the catlike thing as it tried to climb on my chest. In a dream the crone knocked on my door and told me my house was hers. I said no and closed the door on her. At one point I dreamed about patrolling my house and succeeded in terrifying my cat. This led me to believe I may have been astral for a few seconds.
The worst have been occurring lately. They aren't really nightmares but they are annoying. I hear high frequency tones, like what you hear during emergency broadcasts on TV but higher. Sometimes I will see locations. Whenever these types of dreams start, I ignore them. But now they are different. Ever since I got a set of your cards, I now see symbols. Mostly they rush past too fast for me to make them out. The tones will sound off. And all of this makes me feel as if someone is trying to jackhammer all this information into my head. The center of my head will hurt and vibrate a bit. In one of these "dreams" I tried to wake myself up then realized I wasn't sleeping at all. I opened my eyes to see my room, closed them and the images would flash again.
How do I stop this? The tetrahedron you speak about works most times but there are times it's a struggle to stop whatever this thing is from ruining my sleep.