Hi David! Welcome from the seaside on the other side of the world.
Depending on the size of your spare bedroom's windows, a quick, cheap and easily reversible way to black out the room is to simply slip a few black garbage bags over the flyscreen, pillowcase fashion, and then push the whole ensemble back into place. No nails, sticky tape or Velcro required and no need to fret about any gaps in your tent when moving in and out of it.
Kindly,
Molli
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