There are dreams that only feature the dead while there are those that are used to contact the dead. When you contact the dead in your dreams, there is a clear intention to converse with the person who has already passed on.
Most of the times, however, people contact mediums to do the contacting for them. There are also methods that require the use of special ingredients and rituals.
However, there are also ways to contact the dead through dreams in the simplest of manners:
Need to communicate
For you to be able to contact the dead, you must want to communicate with that particular person. You have to have the desire to know vital information about the dead person that only he or she knows. That makes the contact very urgent.
On the other hand, you may also want to communicate for the sake of one last conversation, albeit in a dream. It can be comforting to get a chance to communicate even after death.
Eager to listen
After requesting an audience with the dead person, you should wait for a response. You have to open your mind and wait for possible signs coming from the one you are contacting. You have to make sure that you know if the dream that comes to you soon after is an answer.
Understanding the dream
To know if you are communicating with the dead or merely dreaming, you have to understand what the dream is telling you. If the dream has some elaborate advice that really sounds like something that person will say, you may have been able to contact the dead person.
In the same way, a dream that answers your questions may be evidence that you have, indeed, communicated with the dead.
Contacting the dead in general is frowned upon by Christianity. However,it is common practice in several new age cults. Even those who do not have any fixed beliefs regarding communicating with the dead may have some dreams about a dead loved one.