I get the same thing as well. Dream of a stranger, and months or years later, I saw that familiar face in the most unlikely place. Also dream of songs I never heard before, but hear it months or years after.

Some people say it's deja vu (nothing but merely coincidence), some people believe it's a sign from God, some believe it's psychic power. But from science, I also don't know. haha     Never heard of any valid (and solid) theory from science. Just a wild theory, it could be that the intergalatic forces has form a harmonious equilibrium at that moment and location which we slept, and distort the higher dimension and allow our concious (brainwave) to travel across it for split second.

Ok, back to reality. It think that should falls under psychology or psychic topic. Nothing to do with time-traveling.