Negative, unpleasant, and terrifying dreams are referred to as nightmares. Though nightmares are reported more often in children, that doesn’t mean adults are safe from nightmares. It is in general that children remember dreams more than adults. As adults, we also have a tendency to repress anything that frightens us. Hence, we do not remember much of our dreams and nightmares. A few people even report recurring nightmares, where they see the same or similar images every time.
Nightmares should not be confused with night terrors. While nightmares leave a fear sensation in the body and mind at night, terrors cause screaming in the individual in sleep, which is not even remembered by them the next day. Negative dreams are more prominent than positive ones.