Doors.
It needn't only be someone opening a door in the house. If all the windows were sealed in the house, then something like a gust of wind getting into the loft space through a gap in the flashing, and getting down into the house, would be enough.

I don't like it when people jump straight to a supernatural explanation just because they can't think of a more mundane explanation. Just because you, or I, or anyone can't think of one, doesn't mean there isn't one.

So what if the lights were near the horizon? You STILL have no frame of reference. You don't know if it's above the near terrain, or distant terrain. If it is not below the horizon and if it is not casting a shadow/light pool that you can see, and if it is not obscured by terrain/buildings/trees, then the ONLY clues you have to distance are seeing details on the object itself (windows, rotors, etc) or how fuzzy it is from atmospheric haze. Neither of these are possible if you're just seeing a featureless light. It could EASILY have been small and nearby, and your mind, lacking other information, interprets it as convincingly large and far away.
(Musuko, Thu 3 Jul 2008, 21:47, Reply)