It took me some time to work out that with 2 kids now I just don't have the time for side projects anymore. It is impossible. My oldest is also a person that needs very little sleep. He stopped regular daily naps when he was about 6 months old. In the beginning of daycare (2 yo) he was the only kid in daycare that didn't sleep during the day. He also never goes to sleep before 9pm. In summer it often is 10pm or even later.
When he finally sleeps both my wife and me are just wasted. Not ever could I find energy or motivation to "work" after that.
However I still have hope for the future. When the kids grow older and do more for themselves there will be opportunities to write some fun code on the side :)