Is this for real, or perhaps the best scam ever. There is apparently a medical condition that causes some sleepwalkers to have sex with random people while they are sleepwalking. One lady’s husband got suspicious when he found used condoms laying around the house in the mornings.

This is a condition completely distinct from sleepwalking and is a form of sleep disorder called REM behavioural disorder.

Normally, when a person enters the deepest phase of sleep, the REM (rapid eye movement) phase in which we dream, our bodies are immobilised. In the case of sleep sex, this doesn’t happen and the person can act out their dreams.

Mr Buchanan said almost half of all sleep sex cases were associated with psychological problems and, in the case of the woman he described, psychotherapy helped.

More: SleepSex.org, Sleep-Masturbation.com. And a book on the subject: Sleepsex Uncovered.