I think that when we have dreams or "predictions" of the future, either we are very observant of our surroundings, or there is a coincidence of sorts. We don't necessarily have to be asleep.

For example, I had a dream in high school of a young man or boy killing himself. Two weeks later, we were all dragged to the auditorium to be told that a fellow classmate had killed himself. Was that some kind of spiritual precognition, or was I merely observant of subtle behavioral changes in my classmate before he committed suicide? I'd lean more towards the latter.

Similarly, I was once working with in my Mom's office, helping her boss move some boxes around in the attic (awake). The attic roof seemed very weak, so I chickened out. That week, someone else was hired to do the same job, but crashed through the ceiling. Was that a premonition, or was I merely observant of the environment? Again, I'd lean more towards the latter.