In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Handcuffs
If you are in handcuffs then success awaits you, while if you put handcuffs on someone else then you will avoid a person who wishes to harm you.