I don't know how they do it unless their partner is doing all of the parenting. I used to work crazy hours until our kid arrived. Now, I work 10 hours or less per day. My kid doesn't sleep, so this compounds the problem. He never goes to sleep until 10:30 pm, and always wakes up before the rest of us. He is young, though, and every year gets a little easier. I'm more productive this year than I was last year.