I never used any of them because I believe they only work as a placebo, but I took the initiative of finding you some threads regarding the use of crystal in dreams, you can take a look at them here. There's some people with apparently loads of experience

Also, to future posters: please let's abstain from conflict in this thread, if you don't believe in what the OP does, it's no reason to flood the thread with negative responses. Let's keep this in topic