Even if space is expanding and time is irrelevant to a photon,
   time is relevant to humans and space is fixed in overlapping 3D
   grids for us. Hence, why we don't always remember our dreams:
   They're no mental star to hang the dream off of and no effect
   -back-to-> cause we can mentally walk back to. Lucid dreaming
   gives you that ability, but, well, sometimes we don't always
   bring the observer/narrator voice in with us to the dreams, and
   so... they just... happen. When you wake up and they're gone....
   well, they're not *gone*.. they're just a file without a
   filename and no datestamp. But it's there, and your dreams will
   make themselves known in other ways.