Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Unknown Stress

If you ask someone why they feel stressed, they may not be able to point to a specific reason. This is because stress [ For more on 'stress' go here: http://www.braingle.com/mind/534.html ] often comes from a source that the sufferer may not fully understand. If you have an easily identified source of stress, you are lucky (try to get rid of it). Most people cannot figure out why they feel stressed.

Stress comes in three flavors: physical, emotional, and behavioral. A physical stress might be an injury, an annoying sound or an uncomfortable chair. Emotional stress includes things like fighting with a friend, or the death of a loved one. Behavioral stress might come from alcohol, caffeine, or poor sleep.

Looking at these areas and taking a step back to look at the bigger picture may help someone understand where their stress is coming from. For example, someone who feels tense all the time may not realize that it's because of poor sleep due to noisy neighbors (behavioral and physical stress). A good pair of earplugs may make all the difference in the world! Try examining the various parts of your life to see if you can find something that might be causing stress. Experiment to see if eliminating the stressor makes you feel better.
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For more mind exercises: http://www.braingle.com/mind/