Nightmares: Terrors of the Night.Sigmund Freud, who was a famous researcher of the theory of dreams, thought childhood punishments caused nightmares. Also, according to modern sleep laboratory's experiment rapid eye movement occurs during nightmare. Nightmares and night terrors have two major differences. Night terror happens in early night with suddenly awaking, sweating, body moving, and sometimes crying or screaming. Moreover, especially for children, body moving leads a sleepwalking. According to some people, these episodes feel like mysterious things, as if evil causes these things. On the other hand, Nightmares happen about 3 hours before people awake, moreover they happen during