Eh, I've heard of it, but I've never had a proper lucid dream.
I've had dreams where I partially wake up, and then I realise I'm dreaming but instead of fully waking up I keep the dream going. Unfortunately, whenever that happens I can't control it as I've already got some sort of storyline lodged in my brain.
However, there was one incident where I set my school alarm as the song "Until the Day I Die" by Story of the Year, and then I dreamt I was performing in a rock band (not the one I'm trying to reform - a compeltely unrelated one) and we were about to do a gig, and then I (as the lead singer that I am) announced that the next song is called Until the Day I Die. So then my guitarist performs the lead part and I kinda hear it in both the dream world and the real world and I wake up to find it's my alarm. Awesome, right?
But hoenstly, this lucid sh!t sounds amazing - can someone sum up in short how I can train myself to do it?