About the dream levels, I have to admit I am speculating on this levels, because these would involve quite subjective areas of dream experience such as true astral travel and so on. I'd rather keep our attentions on the 2 kinds of dream I am used to have, both taking place on each extreme of the linear process of the sleep cycle.

1.The complete awareness triggered in a dream realm a few moments after getting asleep.

2. The recollecting of deep states of sleep where dreams occur,which I call the regular and popular kinds of dream. These are not quite experienced with complete lucidity but are the recollection taking place on the moments preceding the waking moment.

There is a third kind and that is the merging of the two former. It happens rarely and it takes place in regular dream. I get the sense of being dreaming and then there is a plot and awareness but not for long.

By negative emotion I refer to feelings of passivity and impotence. Not raw fear or anger. Cause these are somewhat "positive", or rather active charges in the spectrum of "negative" emotions.

Can you explain what kinds of emotions you use and explain a bit more about the scan?