I had a cognitive science professor relate a story about a similar liminal dream. He had a long dream about a visit to the library. Every element of the dream built to someone yelling "look up!" and when he did, he saw a large book falling right towards him, so he was about to knock it out of the way. He woke to find a book falling from a high shelf right above his head - and his hand already extended to knock it away.

Did he have a prophetic dream? Probably not. Probably he saw the book through barely-open eyes and his brain generated and stored the entire dream instantaneously and he only thought he had experienced it in normal time.