I recently managed to get my hands on the Hemi SyncŪ Lucid dreaming series, which is basically a set of LD induction casettes.

Apparently "The Hemi-sync sound patterns on these tapes were designed to facilitate the brain-wave states found in naturally occurring sleep cycles"

Now I'm personally a bit sceptical about this sort of stuff, however, after converting the tapes to mp3, I left them playing all night and managed to get 5 LDs in a row.
Now, I personally believe this to be a kind of placebo effect but if it works then who cares?
I think the main reason for my success is that everytime I woke up (even for a few seconds) I was instantly reminded about LDing, this then carried on into the dream world. Or maybe the whole "facilitating the brain wave states" isn't a load of BS.
Maybe you could try something similar. If you can't get induction tapes, maybe a set of 3-4 songs that remind you of dreaming that you can leave playing throughout the night.
Just an Idea.
Hope this helps