Hey. I figured I'd post the ebook that helped me the most in my lucid dreaming career. This book explains sleem, REM, brain waves, methods, the science behind it... well, all you can ask to know. If it wasn't for this book I highly doubt I would be where I am right now. Enjoy guys (no wait time on this file host, thank god!):

Code:
http://uploadvault.org/files/get/R8upSXLwEw/lucid-dreaming-manual.pdf
P.S. - AFAIK its a free download, so this isn't illegal.