This is some sound that basically says “The next time I am dreaming, I will realize I am dreaming.”
This will send a message to your brain once it is looped over and over and this is still in testing, but it makes enough sense that it will work.
Voice recorded by davmandave on #LD4ALL chat , full credit to him.
[EDIT: Link fixed.]
If anybody has trouble trying to loop this, you can ask me and I will gladly E-mail the file to you.