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The hedonic treadmill effect: Experiencing a sense of loss or emptiness after accomplishing a significant goal is common. Happiness guru Sonja Lyubomirsky notes that achieving one goal often leads to the desire for even higher goals, and the tendency for you to continue moving your goal post forward, forever in search of happiness.

How to cope: One way to move past that post-achievement malaise is to plan another adventure. Anticipating and looking forward to future experiences, even on a smaller scale, can boost your happiness. The author here emphasizes that the pursuit of a goal, with its associated challenges and milestones, brings happiness; perhaps even more than the achievement itself.

There are benefits to keeping a full calendar in retirement even though you may no longer need to do so. Continue to seek challenges and exciting opportunities no matter where you may find yourself in life.