Inspiration hits. You want to make changes in your life, and follow the typical process of having a sit down with your self and either mentally or on paper coming up with a list of all the problems you feel you want to work on. At this point you feel motivated and excited about making wholesale changes.
The tendency then is to try and tackle all of those issues and changes all at once. But this can lead to burn out and/or feeling overwhelmed- both of which eventually lead to you likely not making any significant changes at all and falling back into your old patterns.