Summary of “What Are Dreams? Here Are the Predominant Theories.”

For all the commonalities dreams exhibit, they vary across time-people who grew up watching black-and-white TV are more likely to dream in black and white -and culture.
A 1958 study determined that compared with Japanese people, Americans dreamed more about being locked up, losing a loved one, finding money, being inappropriately dressed or nude, or encountering an insane person.
Japanese people were more likely to dream about school, trying repeatedly to do something, being paralyzed with fear, or “Wild, violent beasts.”
If human dreams sound bleak, bear in mind that even negative ones can have positive effects.
In a study of students taking a French medical-school entrance exam, 60 percent of the dreams they had beforehand involved a problem with the exam, such as being late or leaving an answer blank.
Those who reported dreams about the exam, even bad ones, did better on it than those who didn’t.
So the next time you dream about an education-related sexual experience in which you are both falling and being chased, don’t worry: It’s probably totally meaningless.
This article appears in the April 2019 print edition with the headline “Study of Studies: Bad Dreams Are Good.”.

The orginal article.