When I had newborns if I had to take work home with me or stay late it would increase the stress on my wife to take care of the kids. So even if I was a little sleep deprived I went into work with a "I have eight hours to get this crap done" attitude that really pushed up my productivity levels.
As far as skilling up there is more to developing skills than just pushing code to GitHub. I found that it's easier to read a Kindle one handed (holding a baby with the other) so I started buying books about some of the more theoretical aspects of computer science that don't always seem to go with my day to day coding job. I have had many "light bulb" moments doing that by either being reminded of things I had learned in school or learning something new about how things work.
