Nancy is aware that she is dreaming when she has a nightmare, so she concentrates and changes her dream from bad to good. this is a good example of dreaming.

Lucid

Explanation:

Here, the given example is of lucid dream because Nancy already new that she was dreaming. Another characteristic of a lucid dream is that the dreamer has a certain degree of control or can gain some control over what they are dreaming like the environment, the mood or the narrative. Here, Nancy also changed her dream from bad to good by concentrating and therefore, this is clearly an example of lucid dreaming.

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.

it is a better alternative