You must have discipline to be productive. When you're at your home office, you're still at the office.
Time is money.
The axiom is especially true when you're a freelancer. No doubt you've heard all kinds of advice about how to manage your time and arrange your priorities. You know how to make lists and keep track of your progress. All that is fine when you're in an office where everyone else is in a cubicle working and distractions are few. It's not so easy when you're a free agent working alone in your home office.