Many have sincerely said and believed that a dear friend or family member tried or has communicated with them by means of dreams. Others have said a loved one who has died came to them in dreams and gave them warnings and or encouragement.
That we as humans dreams when we are asleep is a scientific and psychological fact. The Bible also acknowledges that we as humans dream and it also gives the reason why we dream.....notice what Ecclesiastes 5, verse 3 and 7 says concerning why we may dream of a loved one who has died: "For a dream certainly comes in because of abundance of occupation.....vs. 7 says: "For because of abundance of occupation there are dreams". What these two verses are saying is that whatever we are preoccupied or occupied with either physically or mentally we will dream about that scenario or event; especially when we are grieving over the loss of a loved one.
Our mind which is a which is a beautiful component of our awesome brain, obsorbs everything around us like a sponge......this is why we reminence about the past and present and speculate, dream or use our imagination concerning the future because of our thinking minds.....Once we fall asleep for a good nights rest that part of our brain that filed away everything or every event that we've experienced in our lives, especially the loss of a loved one, we are bound to dream about. We can become so consumed with grief and because we are so sorely and thoroughly obsorbed in thinking about them, or "occupied" with missing them we will have vivid or foggy dreams of those whom we've lost to death. The dreams may be very vivid or realistic.
Some say in their dreams that a deceased family member or friend came to warn or encourage them......Think about this: Before they died their personality was that of an encouraging person or their personality was that of a person who showed sincere concern and interest in you and others, well it is only natural then to dream of them saying to you: "Be careful" or "Don't give up". Perhaps on certain occasions you've heard your loved one say those things to you before they died. As a result you dream about that.
One can believe that because the Bible says at Ecclesiastes 9:5,6 and 10 that "dead are concsious of nothing at all....", verse 6 says: ".......their love and their hate and their jealousy have already perished, and they have no portion anymore to time indefinite in anything that has to be done under the sun....." verse 10 says "......there is no work (physical or mental activity) nor devising nor knowledge nor wisdom in sheol (or mankinds' common grave), the place to which you (we all are) going.....
Simply put our dead loved ones asleep in death where no activity exists. They cannot come back to help, warn us, or harm us in any way. Only Jehovah God can awaken them from death to life again. He has promised to do so according to His Word. This is a promise that millions of us await the fulfilment of (John 11:1-44; Isaiah 26:19; Acts 24:15).