I think a lot of nightmares are neg created/influences - especially repeating ones. I have had a couple of dreams relatively recently, one in which I think it was an astral snake attacking me, resting its head on my lap in the dream and when I woke up I had a sharp pain in my upper right thigh, like it was biting me there. Since about then I have had trouble raising energy past that point, and have some real nasty blokages built up in the area. It has got to the point where I can barely raise any energy at all

I think the reason for these things is to build up core images in your mind, so treating with CIR is a good plan. Once the images have taken root, they have a handle on you and can suck out yout energy, on way or another.
Zugzug what have you experienced? and Andy, that sounds really really scary. Have your CIRed the memories? If so, did you notice and interesting physical, mental and/or energy effects?