They differ in experience, cause, and when they occur during the sleep cycle. First, night terrors differ from nightmares in the experience itself. Night terrors are vivid and are often followed by sudden, horrible sensations accompanied by disturbing mental images (Horne, 1992, p. 481). Second, as mentioned in the first slide, the child rarely remembers the night terror; while nightmares vary in this aspect. Night terrors cause more fear and anxiety than nightmares, as demonstrated by the fact that children who experience night terrors are inconsolable (Murray, 1991, p. 119). Additionally, there are significantly more vocalizations, motility, and autonomic discharges during night terrors (Murray, 1991, p. 119). Third, night terrors usually occur as a result of an external cause of resentment or trauma. We'll talk more about this in a later slide. While nightmares generally do not have to be associated with an external problem (Murray, 1991, p. 114). Finally, although both occur during slow-wave sleep, nightmares are usually limited to the second half of the sleep period, while night terrors occur during deep sleep during the first sleep period (Murray, 1991, p.. 114 &