Somnambulism is a condition that causes people to be active while sleeping. Somnambulists may walk, eat, drink, clean, talk, or even drive while asleep. These activities occur most commonly while the somnambulist is dreaming, during the stage of deep sleep. Those affected do not tend to remember their actions.
Sleepwalking has been known to lead to extreme events including homicide. There are reports of an Australian woman who would sleepwalk and have sex with people unconsciously.