I posted an article about this in the "World Outside Porn" forum,

Article

I think it could make a good porn flick plot, what do ya reckon?

"A woman seduced and had sex with strangers while she slept and later had no recollection of her infidelities due to a sleeping disorder, her Sydney doctor said Thursday.

The middle-aged woman had no idea that she was sneaking from her house at night in search of sex with random strangers until her partner awoke, discovered she was missing from the bedroom, and found her having sex with another man".