My grandmother also had dreams about actual events she didn’t yet know about.

She described these as being more vivid than real life, in which she knew more than she would have in a waking state.  She’d learned over time how to interpret them.  If she dreamed of a messy house, that meant there was turmoil in the life of someone close to her.  (Having read a little Freud from a set of Great Books of the Western World that my dad had ordered from a door-to-door salesman and proudly displayed in their own separate bookcase in our living room—despite his never, to my knowledge, having actually opened one of them—I found this symbolism natural and appropriate.)
 
Also, drawing on her experience in various kinds of modeling, if Granny dreamed she was modeling a bridal gown, she had learned through experience that this meant somebody close to her had died. (I had no idea what Freud would have made of this.  Possibly the white gown reminded her of angels’ robes?  Anyway, that was what she’d discovered it meant.)

And she’d proved it with startling accuracy.  For example, one morning she woke up from dreaming she was modeling a bridal gown, turned to my grandfather, and announced “Liz died.”  Although Granny’s sister had not been gravely ill, this turned out to be exactly what had happened.