I dunno that it's cut and dried.
Me? I'll sleep through storms and music and loud cars. But if you even tiptoe into my room, I'm awake and usually already moving by the time you've taken a few steps.
However, different people cause different levels of response. My wife and kid can usually get close to the bed, maybe even reach out to touch my leg. My best friend is the same way. My dad, and my best friend's husband I wake as soon as whatever it is that my brain recognizes is in the room, but I'm not on edge the way I am with anyone else.
My dad is similar about sounds outside the house, he'll snore through a hurricane, and has. But if you speak his name quietly outside his door, he's awake and talking to you, ready to move if he needs to.
My wife though? Fuck me, she sleeps hard. I have had to shake her awake more than once.
The kid is more like my dad with their name being called, but they also wake up to any loud noises outside. They will, however, sleep through an entire conversation right outside their door.
I believe the reason is that our brains filter senses all the time, awake or asleep. Everyone filters a little differently. So it makes sense that we'll all pick up habits of filtering things our brains have learned are low priority, but rouse us for higher priority things. What's crazy to me is that those filters don't always make sense.
I dunno.
I think probably the whole idea of chasing marriage early. There's some degree of pressure even now for young adults to pursue marriage as a goal. Which, if that's what you really want, go for it.
But I never saw marriage as something to chase for the sake of being married.
For me, it was and is about having a partner, a person who is the other half of me. The person is what matters, not the fact of being together.
I can't say whether or not things would have been better or worse had I been more actively seeking a spouse. I likely would have been a father sooner. I probably would have had less short term partners, and medium term ones as well.
But I also wouldn't have the life I have now. And while there's stuff I certainly wish I could magic away, the partner I have and our kid aren't on that list.
Because I wasn't chasing the idea of being part of a couple, when the right person came into my life, I was able to allow it to happen organically. The experiences in the past made me better prepared to do my part of things. It all made me a better partner than I would have been at 25 or even 30.