Music in campground until 4:30 AM !!!!

I went to bed about 10:30 last night and noticed someone had their TV or stereo playing. Wasn't that loud and figured it would be turned off soon. Had talked to neighbors earlier in they day and they all seemed like nice folks......traveling retired. Well for some reason I woke about 2AM and the music was still going.... Jeeze are these people still up???? It wasn't loud per say but it's 2AM. I fell asleep and woke again at 4:30AM. The music is still going...come on people. I got out of bed and went outside. Somehow the DVD player on my outside entertainment had turned on oops. I quickly turned it off and slid back in bed. Glad volume was only set at 4 and bay door was closed, but felt like a fool. Any of you ever have something as asinine happen to you?