[avalaunch]

awjr did a great job answering your question. I just want to add 2 more things that help me:

1. Get out of the house to work, at least occasionally. I find I'm often most productive working in a coffee shop or at a Panera Bread type restaurant (no waiters, free wifi).

2. Don't quit immediately after finishing off a feature. Start working on a new feature and then quit for the day. This one is big. Whenever I do this, I find my mind continuously returning to the new problem and coming up with ideas on how to solve it. At that point getting back to work the next day is easier than not.

Finally don't stress out too much about what hours you work. Sometimes I work in the morning. Sometimes I work at night. I work around spending time with my son, which is what makes me happiest. That's the best part of being self employed - having a flexible schedule that let's you maximize all of the activities you enjoy most.