night terrors. a psychological disorder in which the sufferer is not paralyzed by the neurochemical dopamine in sleep. violent nightmares are acted out while the sufferer is in REM state, occaisonally resulting in sleep walking or other unconscious action. in rare circumstances, people threatened in dreams have killed people, all while asleep, and awaken with no recollection of the deed.
night terrors. but they can't kill in their sleep here, because that would defeat the purpose.