By day, Lee Hadwin is a nurse from north Wales, UK and by night he is an artist. That's not so unusual, but here's where Lee is different:

... but when he wakes up, he says he has no memory of having created them.

Hadwin has been walking in his sleep since he was four, but it was only when he stayed over at a friend's house, aged 16, that he first began to draw in his sleep. "The next morning, my friend's mother found drawings all over the walls in the kitchen," he says. "But we had been drinking that night, so we put it down to that." (Source)

Gallery of Lee's sleep-walking art | Video of Lee sleepin' and drawin' at Cabinet of Wonders (kind of hard to see b/c it's dark) - Thanks Emperor!