How can i legitally make myself feel like i'm floating? ?

Like a type of mental meditation thing I could do.. I've been listening to downtempo leftfield IDM music and stuff, and I'd dead serious, how can I put my self into a state of ming where I, I guess, can't feel what's beneath me? XD feel like I'm floating.. Disappearing.. Dissolving, completely losing reality. (: thanks so much.. Please, no sarcastic rude comments. I'm really serious.