After you have fun, you usually desire to jump immediately to doing something productive. Failure to find something productive within a few seconds from terminating your having fun session might be frustrating enough to make all the feeling good and ready for more work state that you reach after a having fun session disappear as if you didn’t have fun at all in the first place, which leads to sucking the reward out of the effort that you’ve put into reaching that state, and that waste of reward may be enough to trigger a depressive episode. When what you consider to be productive is already determined and scheduled on your calendar, going through any of this frustration will not be inevitable. You just want the productive tasks that will make a difference and get you closer to your goals that you’re supposed to do today clearly stated, determined, defined, and decided. When you become too tired to get those tasks over with, you’ll then consider having fun one way or the other. That’s why you should put the tasks that will make a difference in your life, success, solving your problems, and reaching your goals, and the tasks that are considered by you to be the most important and productive tasks that you should do today on your calendar under the tasks of today’s date anyway, even if you are too tired or not in the mood or not ready to do them at all today.