halation

This also applies to type; the term is used to describe the problem with text on highway signs at night being blurred by light striking it. This is why the current, ubiquitous "Highway Gothic" typeface on road signs in the US is being replaced with the more legible and less halation-prone "Clearview."

I am a creature of the night.

Boundaries according to who? Is there some prescribed darkness zone of which I should be aware?

A spreading of light beyond its proper boundaries.