I seem to recall an incident a few years back. There was a couple who got divorced, and he moved into an apartment one floor below where they had lived as a married couple. Not long after he moved out, she started visiting him at night, getting into bed with him, and having sex. This went on for quite some time until the man asked her if she wanted to get back together, since she was visiting him so often. Turns out she was sleepwalking, and she didn't remember any of it. I think they got back together, but I'm not sure.
There are also accounts of people who take Ambient getting in their cars, driving to Mickey D's, then driving home again. "Honey, where did all these wrappers come from?" Amazing stuff.