It was an exercise I tried where I would meditate for a minute or so to clear my mind first. Then I would allowed visual thoughts/images to arise and take my attention. Once they took my attention I would recognize it, but would maintain my consciously awareness within the imagery and interact with situation/environment (as one would when in a lucid dream). Sort of like conscious day dreaming or lucid day dreaming I guess. The theory was if I did this over time, before bed, I would develop the habit of recognizing when my attention was lost in these visual thoughts, remain conscious within the thought, and develop that recognition in dreams.

The technique was tiresome though and made it harder for me to sleep at night because my mind was too active afterwards. It also produced no lucid dreams after a 5 days of effort, so I abandoned it for the purposes of initiating lucid dreaming. From time to time I use the technique to just explore my subconscious mind if I need to understand something better. I remembering seeing Jung had a similar technique and called in 'Active Imagination'.