This morning "Women's Hour" had a piece which mentioned "reasonable belief in consent" on the grounds of sxsomnia - basically that the victim allegedly made sexual advances to the defendant whilst sleep-walking. Sexsomnia is apparently a thing, though rare. This is apparently the first UK legal case where the victim may have suffered from it, although previous rape defendants have claimed to be suffering from sexsomnia. There will be a BBC3 documentary on the case tonight.