For that bolded reason primarily, I think that you, as an adult and a wife, need to reassess your mothers 'words of wisdom' and decide if they apply. You can't reproduce your parent's relationship - and it sounds like you really wouldn't want to, either.
I've lived outside of the US (I'm thinking of Spain, right now), and yeah, if you were going out to hear music, the DJ might not show up until midnight, and the crowd isn't going good until 2am, and yes, there will be a party going on until the sun rises - that was just - normal. The idea of a party that started at 9pm - please. People are just sitting down to eat dinner at 9pm - and they still need to eat, change, drink a lil, and meet up before the party gets started. Kids parties started at 9pm - maybe. And half the guests wouldn't show up til 11, still!
So - from that POV - the late hours (in my mind) aren't an issue, because it's in a different culture. If he was in Brooklyn, it would be an entirely different thought pattern.
Do you have any issues with your DH being out that late besides 'it's going against what mama said'?? If you don't - I'd let the man enjoy his hiphop in non-clockchecking peace.
The way DH and I work things out - as we both refuse to 'clockwatch' on the other, is that we are expected to be home by midnight. If we opt to stay out later, we expect a phone call no later than 12:15, to let the other know that we are cool, and to give a rough estimate of when we think that we will be back home.
Maybe some of the other ladies don't have a collection of night-owl friends - there has been many a night I'm out past 2am, in places other than between someone's legs.
Yeah I went out last month and was out pretty late. I looked at my phone and the time had really gotten away from me. And I was at a wine bar with some white chicks and you know how they like to drink....I texted dh @ like 1:30 to tell him I was on my way, he never responded, called, etc. I got home at 2:30 and this fool was asleep I was like I'm rushing to get home like my daddy was waiting on me and this fool aint even up