Sexsomnia is a rare sleep disorder characterized by engaging in sexual activities during sleep. Some synonyms for sexsomnia include sleep sex, nocturnal sexual activity, sex during sleep, and automatism sleep disorder. Sleep sex is used to describe the sexual behavior that occurs without conscious awareness during sleep. Nocturnal sexual activity is another term that refers to engaging in sexual activities during sleep. Sex during sleep is self-explanatory and indicates sexual activity that happens while a person is asleep. Automatism sleep disorder is used to describe any form of non-purposeful or involuntary behavior during sleep, such as sexsomnia. In short, these synonyms are used to describe sexsomnia and related behaviors that occur during sleep.