Was just going through my daily Gawker blog round-up and on io9 saw this article: Lucid Dreaming Can Be Induced By Zapping Brains With Gamma Waves

By administering mild electric currents to the brain, neuroscientists from Frankfurt University have successfully induced self-awareness in sleeping volunteers. Amazingly, the technique could be used to help people take better control of their dreams. But it's also a discovery that's offering critical insights into the very nature of consciousness itself.
Let's make DIY rigs and sell them! Would probably work a lot better than a lot of those lucid masks.