Sleepwalking, also known as somnambulism, is a sleep disorder belonging to the parasomnia family. Sleepwalkers arise from the slow wave sleep stage in a state of low consciousness and perform activities that are usually performed during the day. These activities can be as benign as sitting up in bed, walking to the bathroom, and cleaning, or as hazardous as cooking, driving, extremely violent gestures, or even homicide. Other activities such as eating, bathing, urinating, talking, dressing/undressing, texting, emailing, exercising, walking a dog, painting, whistling, dancing, moaning, gesturing, grabbing at apparently hallucinated objects, committing murder, and/or engaging in sexual intercourse are some of the activities that have been reported or claimed to have occurred during sleepwalking. 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 incident, as they are not truly conscious. Although their eyes are open, their expression is dim and glazed over. Sleepwalking may last as little as 30 seconds or as long as 30 minutes.