Superman is a fictional superhero appearing in American comic books published by DC Comics. The character was created by writer Jerry Siegel and artist Joe Shuster, high school students living in Cleveland, Ohio, in 1933. They sold Superman to Detective Comics, the future DC Comics, in 1938.
A parasomnia is an unwanted physical movement or action during sleep. This group of disorders is classified by disorders or arousal from NREM sleep, those associated with REM sleep, and other parasomnias.
Both night terrors and nightmares are sleep disorders classified as parasomnias (abnormal episodes while asleep). The main difference between them is the stage of sleep during which they appear. Night terrors are Non-rapid eye movement parasomnias (NREM) and usually appear on N3 stage (deep sleep); they will specially appear early in the night.