This is strange thing indeed. I've encountered this phenomenon at least 3 times. It's like a dream, but you are aware of you lying on the bed and there is no WILD sensations or anything....
It's like a very clear and semi lucid daydream or something close...

In my last dream of this type I became fully lucid and was able to change some things, but I had very limited control and summoning tricks failed...

PS: In the past 3 days I found myself seeing "movie like" scenes before I'm fallingasleep. I set my thoughts aside and dont think of anything, just this scene and it seems so damn real... But at some moment my awareness returns and I'm losing concentration... and scene disappears...
I have no control over scene, but I guess it can be great help when trying WILD...