For me it was just blackness in the shape of an eye which lasted for a few moments, it could have been something different but that's just how I interpreted it. It felt almost like there was some seperate energy inside me, but I don't really know. It's the involuntary head movements that make me think that. But it could just be my discomfort with the whole thing that's making me paranoid.
Lucypur, that makes me feel a bit better. I am just going to keep trying every night and see where it goes. I guess that my only fear is that it can harm me somehow but if meditation can't hurt you then there's nothing to really worry about right