Some researchers cite the lack of prefrontal activity as a sign that the function of sleep is restorative. Sleep gives a rest to the frontal lobes, the most active part of the brain while awake. Most parapsychologists, however, are not interested in the physiology of dreaming. They focus instead on the content of dreams, which they believe reveals a passage to the paranormal or the supernatural. The prophetic or clairvoyant dream is perhaps the strongest reason for believing that dreaming is a gateway to another world.
Some dreams seem uncanny.
They seem to foretell events. If a significant number of dreams of just a single person corresponded to future events, this would be a great benefit to humankind and we should try to find out what mechanism is at work here. However, no such person has yet been found. Individual dreams that occasionally seem clairvoyant provide very weak evidence for clairvoyant dreams. About ten years after the dream an airliner went down in San Diego.