Dream borderland studies

The borderland of dreaming is hypnogogia. I've been working on this for a long time and know that it is really interesting but the more i've tried to seriously concentrate on these incredibly illusive visions the farther away I feel like I've moved. So I want to try to study this in a more organized way. If anyone wants to join me then by all means.
So my plan is that I will first spend 10 to 20 minutes doing visualization meditations, then lay down and record what I see.
November 16th. Did 20 minutes of visualization until the visualizations started moving on their own. I like to focus on tactile issues; I usually see myself sitting under a tree and feeling the bark of the tree. Then I look at the grass, ext. If I can't the color of something right, sounds funny but I imagine a color crayon with the right color and that usually works. After the visualizations started to go rogue I laid down.
There is definitely a tremendous difference between doing and not doing the visualization. When I don't do it I usually spend the first hour just trying to get anything to happen, after the visualization meditation it just goes.
Quality of H.I.: low to medium.
Brief description: spent some time flying, nothing too exotic. I lost it for a moment at one point and when I closed my eyes I could only see a residual bar of light so I visualized a woman scooping up the light with a cup like it was water, when she dumped out the water it would not intentionally turn into parts of a new scene. It became like tables and chairs and cups and things, then a castle and I used that to ride into a new scene.
State on waking: Felt jittery and strange, state stayed with me for several hours after.

Questions: Why can't I stop flying around, whenever I get in a good place I end up sailing off to the next one, I tried to stop it once and it killed everything, I ended up with a black screen. Its frustrating

Visualization meditation: 10 minutes
Quality of HI: low to medium
Description: Spent a lot of time in the jungle for some reason, perhaps my room was too hot. Discovered a new technique; try to throw a dart at a dart board. For me I can of course throw it but there would be no space, it would just be flat. So then I would try to force it to demonstrate space, in whatever way I could imagine and that effort caused the whole style of visions to change; taking on a new level of clarity and quality and being more rogue (self created).
Problems: I still can't stop the movement. If the vision starts with movement then so far its almost impossible to stop.
Observations: One important thing is that normally, in full consciousness I see the visualization centers of the mind and seeing visual impressions when you close your eyes to be located on two different places. So normally I can't visualize something and immediately see it behind my closed eyes. But I realize that active HI periods those spaces are one and the same. I realized I can't visualize anything without immediately seeing it. So during these high times the consciousness is in a different place.

Question: Are these high HI times the same thing as being in REM?

Fascinating. Thanks very much for starting this research! Where did you first learn about visualizations to the point where you can do it so well like this? I'd like to learn how.