I don't think dreams are predictive per se; I think they are a construct for putting some recognisable garb on a premonition.

Materialists, of course,will tell you that such premonitions are merely extrapolations from scraps of data, and not prescient at all, and it is true that often the way dreams scramble their data and their imaginary bits that there's no hard ground for rebutting such an interpretation, but I think its a dodgy explanation myself.

Larry Dossey (among other wirters) has some observations on the capabilities of the non-local awareness function of the human "mind", or spirit -- let's leave the structural argument aside for the mo -- which are most interesting.

Some of his books.

A