Harker had experienced something quite similar to having a fever dream. Or if he had experienced taking drugs, he would have more accurately compared it to a bad trip.
Time moved in a weird and nonlinear manner. And it's not just hopping from one memory to the next. It scattered everywhere, these small moments, and they could happen all at once, or not at all.
The events that did make an impression on him enough to remember even after he woke up all shared a common factor. They were the moments with Edmund, and the moments right after his passing.
"Would you look at that, my love? Orion's belt. The Christians sometimes call it the Three Kings. The Chinese call it Shen, a western mansion of the White Tiger. In other European mythologies it could be a god's sword or distaff." Edmund said.
They were on the deck of the ship, probably Edmund's ship. It was anchored to the port, and they were simply stargazing and basking in the moonlight alone there.
