So I made my original post knowing full well that my situation is my own and YMMV, but to speak to those concerns wrt my schedule/life...
>You fall asleep instantly every night...
Actually, yes! Two points there. First, when I'm out of my routine, not working out, drinking lots of coffee and eating like garbage, I sleep like ass. When I'm in my routine, eating well, and only having a cup of coffee with breakfast, I'm incredibly energized throughout the day and end up suddenly feeling tremendously tired right around 8:45/9:00.
The second part is that my father's side of the family is notorious for falling asleep anywhere, anytime. There's a litany of photos of us passed out on couches in the middle of packed parties.
> Meltdowns
They happen, but they don't really rock the schedule in my experience. Bedtime somehow always ends up being bedtime. Might shift by ~15 or so occasionally, but never in a way that nukes my bedtime or anything.
>One of the kids wakes up at 3am.
This is entirely YMMV, but we sleep trained. For whatever absolutely fucking weird reason, neither kid has ever got themselves out of bed in the morning, they always wake up and wait for us to come get them. Earliest I hear one of them is occasionally 6 on the weekends, usually closer to 7. I feel tremendously lucky here, and recognize how not normal this is.
>Forgot dinner ingredient and load kids up...
Nah. I do my best to buy ingredients on the weekend for the week. Definitely isn't foolproof, but usually we just pivot to a meal I'd planned for another night, or we always have easy to make shit like mac and cheese or grilled cheese and tomato soup lying around to fall back on. Life doesn't need to be perfect and I'm cool with pivoting and not sticking to plans.
>Friends coming over
For our own sanity wrt my wife and I's schedules, we hang with friends on the weekend. Weekends are a lot more freeform for us.
>Household maintenance
Naturally, whoever isn't playing with the kids just falls into keeping the laundry moving and cleaning the kitchen. I'll take the kiddos to the grocery store on Saturday. Dishes happen quickly, we all help there.