Lucid Dreaming and the Astral Plane
I've kinda poked around at some people's dream journals and I notice that they describe a sort of... nasty humming when they LD. I believe that's the sound of the lower astral plane... NOT a pleasant place to be. The lower astral plane is where nasty people go upon their deaths and where all sorts of really negative crap just festers, rests and torments the living. You know the feeling when you wake up from a nightmare and you feel like someone is standing over you? It's those lower bodies on that astral plane who are doing it.
LDing is really something that needs a lot of guidance in order to be safe doing it. Prefferably from a mystic who is knowlegable in certain stones to place under your pillow to protect you and whatnot, certain techniques and meditations to help you get to the right place. Even certain esoteric christian artifacts will protect you. But when you jump into LDing and have an OBE, unless you're protected by the white light (which is surrounding you, not the almighty end) you're opening up your astral body to disease, sickness, mental illness and all other sorts of nasties that you will bring into your physical body upon awakening. Not to mention the lower astral plane is where people who trip on any sort of drug go first on their trips. It's just a whole Pandora's Box of badness.
If anyone wants any suggestions on books to read, I reccomend Bruce Goldberg as an author.
Just, please be careful with these things. There's a lot more to the earth and life than we are truly able to see... and a lot of that we really DO NOT want to be messing around with.