I have a full time job as full stack developer, wife and 2 kids. I commute every day 1 hour in each direction. On a work day I woke up at 5:30 am, wash, dress and jump in a car at 6:00 am, so that I can be at work at 7:00 am. I usually go home at 3:00 pm and if there is no traffic jam I am at home at 4:00 pm. I eat something, change clothes, clock says 5 pm and I try to spend some quality time with my wife and kids. Kids go to bed at 8 pm and at 9 pm I am exhausted as hell, and I fell to bed. And this repeats every work week.
On weekends I barely have time for my side projects (one is familyokjobs.com, which I created over several weekends when wife and kids were sleeping), because there is always something to do around the house. What I'm trying to say: where do you take time for your side projects or studying new technologies?
In the meantime, enjoy your family time because your kids won't always want to spend all their free time with you (they'll have friends and hobbies to compete with you).
Make sure to exercise. So many on HN experience health problems that originate from inadequate exercise. 30 minutes per day should be sufficient.
8 1/2 hours of sleep per night seems to be an hour longer than what I would expect would be necessary, but if you're getting woken up by a baby then that is good time budgeting.