"Virtually everybody has the natural ability to lucid dream," says Rebecca Turner, author of The Art of Lucid Dreaming.

"We all dream every night - it's essential to healthy brain functioning - and most people are actually quite good at remembering their dreams. Lucidity is sparked by becoming conscious in your dreams, just as you are during waking hours, so it simply combines two normal things we do every single day."

The result? An amazing virtual reality world, where everything looks and feels as vivid as waking life. "This state of heightened awareness tells us a lot about human perception," Rebecca says, "and just how powerful the human brain is..."