That's a really interesting experience. I gotta say that this inbetween state is a very powerful state as I've experienced a couple of times when I was a bit sleep deprived. Once I was just sitting on the bus almost dozing off when I look outside the window and see a person going to cross the street and then got hit by a car. I blinked in shock only to realise that it never happened and that there was no person or car there at the moment. It was so vivid though that you couldn't tell the difference. And also how at times when I was sleep deprived I could just shut my eyes and immediately see a completely different place and people and everything. Much like 'Tomorrow Land'

So there's definitely something in those states that may help with manifestation in waking life since the brain can't distinguish what is "real" or "imagined" and the imagination is sort of running freely. Would be interesting to know what makes those states. I know that our brain frequency changes when we dream for example.