Nightmare

There is a special kind of dream which everyone may occur in their dreams, nightmare, which is an unpleasant dream that can cause a strong emotional response from the mind such as getting attacked by strangers, missing tests, and showing up naked in public and so on.

Even though a growing number of scientists who thought that dreams are not completely random, Revonsuo, a famous psychologist, thinks that "Nightmares may be the brain's way of rehearsing important survival skills, so they remain sharp, even when you do not use them in everyday life and when you are feeling especially anxious of fearful, your brain may give you more scary dreams to prepare you for the danger it thinks you sense."

Although, the danger situations which happened in our nightmares may not happened in our real life, our brain also exercise for us to prepare for overcoming these danger situations. In my opinion, nightmares shows the development of people, because during nightmares, our brain will automatically show what we should do when we meet different dangerous situations.