Generally, sleepwalking cases consist of simple, repeated behaviours; occasionally there are reports of people performing complex behaviours while asleep, but the legitimacy of these claims is often disputed. In 2004, sleep medicine experts in Australia claimed to have successfully treated a woman who claimed to have sex with strangers in her sleep. In December 2008, reports were published of a woman who sent semi-coherent emails while sleepwalking, including one inviting a friend around for dinner and drinks. Sleepwalkers often have little or no memory of the what they do, because they are not truly conscious. Their eyes are open, but their expression is dim and glazed over. Sleepwalking may last as little as 30 seconds or as long as thirty minutes.