Sigmund Freud has been acknowledged as one of the most established psychologists of the world. Sigmund Freud mostly based his theories on sex. Freud has believed that sexual desires are unfulfilled and repressed. This repression of sexual desires tries to satisfy these desires in dreams.
Freud has given a very exhaustive explanation of dreams and has tried to identify seeing objects in dreams with sexual desires.
The book is in original form and is a very helpful guide in understanding human behaviour which is the subject of study of psychology.