I live literally in the middle of rural nowhere, and when i go out i either stay out (hotel, friend) or i drive and don't drink (or i get a lift)
If OPs husband was dead in a ditch, he wouldn't have answered the phone either. And if you call the police on a "missing" adult at 3am, they will tell you that they're not looking, he probably is in a club or a lock in (or indeed out with his special ladyfriend, who knows?). Worrying about it helps nobody.
I am assuming that most of you take your phones to your bedroom. I have never understood that but each to his own. If my DH is out (or if i am out without him) i or he texts "going to bed now, night, have fun" and the phone stays in the living room.
When the DC were small and we had plans? i relied on the help of friends, neighbours and other parents at activities, ran myself ragged for half a day, and on Sunday i got a lie in, breakfast in bed and DH did the parenting.
It was an ongoing conversation with us when events were coming up. Still is, tbh, even though we live on our own now.