In the earlier time of listening to AM radio, I think they played the more interesting songs at night.
And oh yeah. In the daytime in the 70's, when I would turn on the Quad 4 channel speakers and spin records and the FM, the upstairs would then have to turn on their music and crank it up louder, then start dancing on our ceiling. This would happen frequently, and usually when they were not listening to anything beforehand. In consideration I usually kept the volume down simply so that my music would not interfere with them, cheap walls you know, though they never ever showed me the same consideration. Not usually.
But then, when I would strum my guitar or play the piano and make up new songs, the upstairs became very very Quiet, out of character with their usual noise level, as if they were listening, and this would happen even when I was strumming my solid body electric guitar without any amplifier.
Just the very quiet sound of an unplugged electric guitar with Ernie Ball Slinky Strings.
So yes, that also had a lot to do with becoming a night owl. :)