I find that if I spend too much time trying to force these things it never happens. I believe that AP and lucid dreaming happens on the same plane and there is more than one way to get there. Meditation is one way, but if that doesn't work you can try a much more common method: going to sleep. Sometimes it may be easier to become aware while you are already dreaming, rather than trying to jump directly to a dream-like state.
This is how I have had most results.
This is how I have had most results.