In lighter nighttime, there's a 'fuzziness' - anyone else had this?

[colonelmolerat 1]

If I set down a unit in the editor (far away from any light), and set the time to midnight, certain patches of the ground in the distance (where it's a dark blue, rather than the light blue sky or black darker ground) have an odd kind of moving fuzziness, like lots of tiny, slightly-opaque vertical lines moving along the screen.

Has anybody else had this? Is it just my monitor, or graphics settings?