Before kids I was a night owl gamer. Now I can't stay up past 9pm

Used to be up until 2-3am playing online with the boys, sleeping until 10am, no responsibilities. Now I have a 3 year old and a 6 year old and I'm literally falling asleep during their bedtime stories at 8:30pm. My wife laughs at me constantly. Sometimes I miss those days, not gonna lie, but then my 6yo asks me to read him a story and I wouldn't trade it for anything. Just weird to feel like a completely different person in 5 years.