Lucid Dreaming?

Whats this I hear about using machines to wake you up in the night, where you clip it on ur face, i mean wtf, what if it blows up in ur face during the night, i bet you'll be lucid dreaming then, how the f*** can they work? somin about a nove dreamer? ill be queit weary of putting a motherboard on my face! whats your lots views?