Have you ever been walking in your sleep?

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I'm not sure, but I think I have. I remember falling asleep in my bed but waking up on the couch a few months ago. As I tend to remember most things I do, even when I'm really tired, I doubt that I was awake when I went to the couch. Of course, maybe I just forgot about watching TV or something, even though it's highly unlikely. Some years ago after I went to bed, I suddenly gained consciousness (or awoke, I'm not sure). The thing is, I woke up while trying to solve a crossword! Have you ever been sleepwalking? Care to tell me about it?