I have found that there are times that it is harder to write than others. It seems that everything else comes first or a minor distraction is enough to pull me away from the task at hand. A lot of times what it simply boils down to is not enough discipline. What do I mean about that?
Humans are creatures that work best on a reward system. Look at children. A parent rewards a child for doing something good and punishes them for doing something wrong or not doing something when it should be done. A similar approach should be taken by adults. Adults need that check and balance to get them to where they need to go. It's a basic form of motivation, but even more than that. It's holding oneself accountable.