Growing the startup to the point where I can do it full-time is my ultimate goal. I'll admit, it's not easy to stay focused at my day-job. It's not easy to stay focused anywhere for that matter. But I've had to learn to ignore the voice in my head when it's work/family time. Again, not easy, just one of those things you have to do. Learn to live with the excitement eating away at you. My situation is probably similar to yours; my day job, while not in software development, which I'd prefer, nevertheless gives me a lot of time to work on my startup, since I work close to home and have basically no commute, meaning I get home around 5pm everyday.