After a sleep deprived camping trip in Darwin Australia, got mildly-drunk on the post-trip night out. Got back to the hostel 2am ish with girlfriend of the time, crashed out immediately on the bed once getting back to the hostel...
Next thing I know, I am waking up stood still and upright, in some quiet street I don't recognise, wearing nothing but my boxershorts - like a bad dream with no idea how I got there. After concluding that I hadn't been anally violated, I wandered around looking for some familiar landmark. Eventually saw someone on the street looking at me distrustfully who was able to give my directions back to the hostel.
My ex was asleep on the bed, so I woke her up asking what the fuck happened. She told me I fell asleep on the bed, she went to the bathroom and when she got back I got up, and zombie-like walked out of the patio door through the hostel garden. "I called you" - she says - "but you kept going". Said she didn't go after me because she was not dressed BLAH BLAH BLAH. Moron. Worked out I'd been gone for about an hour. Other than that, never done any sleep walking before or since, so you don't have to have form for sleep-related-weirdness.