I am in WDXZ's coverage area. They were on the air past 9 pm at least two nights this past week. I heard it as much as 13 miles away, so they were most likely running full power. When I was in radio (60s thru 80s), no AM daytime operator, particularly one that does not even have post-sunset authorization, would think of staying on all night. I guess some people think the FCC doesn't care what happens on AM anymore.
By contrast, when I was young (50s and early 60s), I was in a small town (Atmore) that had only a daytimer (WATM 1590). Post-sunset authorization did not even exist back then. When our area was threatened by a hurricane, the station could stay on all night with weather warnings ... no commercials ... and they were required to notify the FCC immediately afterward that they had done so. Clearly, times have changed.
I found WDXZ amusing in this regard: they have obviously pre-recorded drops, running every few minutes, saying "The correct time is ..." and "The current temperature is ...." Great, but last Tuesday, we had a severe thunderstorm, and as is always the case, the temperature drops to about 72. But that didn't stop WDXZ from saying every few minutes "The current temperature is 86 degrees."
At least they had the time checks correct.